CN111187772A - CRISPR-CAS systems and methods for altering expression of gene products - Google Patents

CRISPR-CAS systems and methods for altering expression of gene products Download PDF

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CN111187772A
CN111187772A CN202010072631.XA CN202010072631A CN111187772A CN 111187772 A CN111187772 A CN 111187772A CN 202010072631 A CN202010072631 A CN 202010072631A CN 111187772 A CN111187772 A CN 111187772A
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sequence
crispr
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gene
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F·张
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Massachusetts Institute of Technology
Broad Institute Inc
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Abstract

The present invention provides systems, methods and compositions for altering the expression of target gene sequences and related gene products. Vectors and vector systems, some of which encode one or more components of a CRISPR complex, and methods for designing and using such vectors are provided. Also provided are methods of directing CRISPR complex formation in a eukaryotic cell and methods for utilizing the CRISPR-Cas system.

Description

CRISPR-CAS systems and methods for altering expression of gene products
The present application is a divisional application of an inventive patent application having application date of 2013, 12/12, application No. 2013800727151 entitled "CRISPR-CAS system and method for altering expression of a gene product".
Related applications and references
The present application claims priority from U.S. provisional patent application 61/842,322 and U.S. patent application 14/054,414, both filed on 7/2/2013 and on 5/10/5/2013, respectively, having a borde reference BI-2011/008A, entitled "CRISPR-CAS system and method FOR ALTERING EXPRESSION OF a GENE product (CRISPR-CAS SYSTEMSAND METHODS FOR expressing EXPRESSION OF a GENE product)". U.S. provisional patent applications 61/736,527, 61/748,427, 61/791,409 AND 61/835,931 entitled "SYSTEMS, METHODS AND COMPOSITIONS FOR sequence manipulation" (SYSTEM METHODS COMPOSITION OF SEQUENCEEMANEMANIALATION) "filed 12/2012, 1/2/2013, 3/15/2013 AND 6/17/2013, respectively, having Border reference numbers BI-2011/008/WSGR case number 44063-701.101, BI-2011/008/WSGR case number 44063-701.102, Border reference numbers BI-2011/008/VP case number 44790.02.2003 AND BI-2011/008/VP case number 44790.03.2003 are also claimed FOR priority.
Reference is made to U.S. provisional patent application 61/758,468; 61/769,046, respectively; 61/802,174, respectively; 61/806,375, respectively; 61/814,263, respectively; 61/819,803 and 61/828,130, entitled "engineering and optimization of systems, methods, and compositions for sequence manipulation" filed in 2013, 1/30, respectively; 25/2013, 2/month; year 2013, month 3, 15; year 2013, month 3, 28; 20 in 2013, 4 months; 6 days 5 and 28 months 2013 and 5 and 28 months 2013. Reference is also made to U.S. provisional patent applications 61/835,936, 61/836,127, 61/836,101, 61/836,080, and 61/835,973, each filed on 6/17/2013.
The foregoing applications, as well as all documents cited therein or during their prosecution procedures or ("application citations") and all documents cited or referenced in these application citations, as well as all documents cited or referenced herein ("herein cited documents"), all documents cited or referenced in herein cited documents, are hereby incorporated herein by reference, along with the specification, description, product specification, and product sheet for any manufacturer of any product in any document mentioned herein or incorporated herein by reference, and may be employed in the practice of the present invention. More specifically, all references are incorporated by reference to the same extent as if each individual reference were specifically and individually indicated to be incorporated by reference.
Technical Field
The present invention relates generally to systems, methods, and compositions for controlling gene expression involving sequence targeting, e.g., genome perturbation or gene editing using a vector system involving regularly interspaced clustered short palindromic repeats (CRISPR) and components thereof.
Statement regarding federally sponsored research
The invention was made with government support from NIH Pioneer prize (Pioneer aware) DP1MH100706 awarded by the national institutes of health. The united states government has certain rights in the invention.
Background
Recent advances in genome sequencing technologies and analytical methods have significantly accelerated the ability to catalog and map genetic factors associated with a wide range of biological functions and diseases. Precise genome-targeted technologies are needed to enable systematic reverse engineering of causal genetic variations by allowing selective interference of individual genetic elements, as well as to advance synthetic biology, biotechnology applications, and medical applications. While genome editing techniques, such as designer zinc fingers, transcription activator-like effectors (TALEs), or homing meganucleases (homing meganucleases), are available for generating targeted genome interference, there remains a need for new genome engineering techniques that are affordable, easily established, scalable, and facilitate targeting multiple locations within a eukaryotic genome.
Summary of The Invention
There is an urgent need for alternative and robust systems and techniques with a range of widely used sequence targeting. The present invention addresses this need and provides related advantages. CRISPR/Cas or CRISPR-Cas system (the two terms are used interchangeably throughout this application) do not require the generation of a customized protein targeting a specific sequence, but rather a single Cas enzyme can be programmed by recognizing a specific DNA target by a short RNA molecule, in other words the Cas enzyme can be recruited to a specific DNA target using the short RNA molecule. The addition of this CRISPR-Cas system to a repertoire of genome sequencing technologies and analysis methods can significantly simplify the methodology and improve the ability to catalog and map genetic factors associated with a wide range of biological functions and diseases. In order to utilize the CRISPR-Cas system for genome editing efficiently and without deleterious effects, it is crucial to understand the engineering and optimization aspects of these genome engineering tools, which are aspects of the claimed invention.
In one aspect, the invention provides a method of altering or modifying the expression of one or more gene products, which method can comprise introducing into a cell comprising and expressing DNA molecules encoding the one or more gene products an engineered non-naturally occurring CRISPR-Cas system, which system can comprise a Cas protein and one or more guide RNAs, which guide RNA or guide RNAs targets the DNA molecules, whereby the guide RNA or guide RNAs targets the genomic locus of the DNA molecules encoding the one or more gene products and the Cas protein cleaves the genomic locus of the DNA molecules encoding the one or more gene products, whereby the expression of the one or more gene products is altered or modified; and, wherein the Cas protein and the guide RNA do not naturally occur together. The invention encompasses that the expression of two or more gene products may be altered or modified. The invention further includes that the guide RNA comprises a guide sequence fused to a tracr sequence. In a preferred embodiment, the cell is a eukaryotic cell, in a more preferred embodiment, the cell is a mammalian cell and in a still more preferred embodiment, the mammalian cell is a human cell. The invention also includes that the Cas protein may include one or more Nuclear Localization Signals (NLS). In some embodiments, the Cas protein is a type II CRISPR system enzyme. In some embodiments, the Cas protein is a Cas9 protein. In some embodiments, the Cas9 protein is a streptococcus pneumoniae, streptococcus pyogenes, or streptococcus thermophilus Cas9, and may include a mutated Cas9 derived from these organisms. The protein may be a Cas9 homolog or ortholog. In some embodiments, the Cas protein is codon optimized for expression in a eukaryotic cell. In some embodiments, the Cas protein directs cleavage of one or both strands at the target sequence position. In a further aspect of the invention, the expression of the gene product is reduced and the gene product is a protein. The invention includes that the introduction into the cell is via a delivery system which may comprise viral particles, liposomes, electroporation, microinjection or conjugation.
In another aspect, the invention provides a method of altering or modifying the expression of one or more gene products, the method comprising introducing into a cell containing and expressing a DNA molecule encoding the one or more gene products an engineered, non-naturally occurring vector system, which may comprise one or more vectors, the one or more vectors comprising: a) a first regulatory element operably linked to one or more CRISPR-Cas system guide RNAs which hybridize to a target sequence in a genomic locus of a DNA molecule encoding the one or more gene products, b) a second regulatory element operably linked to a Cas protein, wherein components (a) and (b) are located on the same or different vectors of the system, whereby the guide RNAs target the genomic locus of a DNA molecule encoding the one or more gene products and the Cas protein cleaves the genomic locus of a DNA molecule encoding the one or more gene products, whereby the expression of the one or more gene products is altered or modified; and, wherein the Cas protein and the guide RNAs do not naturally occur together. The invention encompasses that the expression of two or more gene products may be altered or modified. The invention further includes that the guide RNA comprises a guide sequence fused to a tracr sequence. In a preferred embodiment, the cell is a eukaryotic cell, in a more preferred embodiment, the cell is a mammalian cell and in a still more preferred embodiment, the mammalian cell is a human cell. The invention also includes that the carrier of the system may further comprise one or more NLSs. In some embodiments, the Cas protein is a type II CRISPR system enzyme. In some embodiments, the Cas protein is a Cas9 protein. In some embodiments, the Cas9 protein is a streptococcus pneumoniae, streptococcus pyogenes, or streptococcus thermophilus Cas9, and may include a mutated Cas9 derived from these organisms. The protein may be a Cas9 homolog or ortholog. In some embodiments, the Cas protein is codon optimized for expression in a eukaryotic cell. In some embodiments, the Cas protein directs cleavage of one or both strands at the target sequence position. In a further aspect of the invention, the expression of the gene product is reduced and the gene product is a protein. The invention includes that the introduction into the cell is via a delivery system which may comprise viral particles, liposomes, electroporation, microinjection or conjugation.
The present invention also provides an engineered non-naturally occurring vector system, which may include one or more vectors, the one or more vectors including: a) a first regulatory element operably linked to one or more CRISPR-Cas system guide RNAs which hybridize to a target sequence in a genomic locus of a DNA molecule encoding one or more gene products, b) a second regulatory element operably linked to a Cas protein, wherein components (a) and (b) are located on the same or different vectors of the system, whereby the guide RNAs target the genomic locus of the DNA molecule encoding the one or more gene products in a cell and the Cas protein cleaves the genomic locus of the DNA molecule encoding the one or more gene products, whereby the expression of the one or more gene products is altered or modified; and, wherein the Cas protein and the guide RNAs do not naturally occur together. The invention encompasses that the expression of two or more gene products may be altered or modified. The invention further includes that the guide RNA comprises a guide sequence fused to a tracr sequence. In a preferred embodiment, the cell is a eukaryotic cell, in a more preferred embodiment, the cell is a mammalian cell and in a still more preferred embodiment, the mammalian cell is a human cell. The invention also includes that the carrier of the system may further comprise one or more NLSs. In some embodiments, the Cas protein is a type II CRISPR system enzyme. In some embodiments, the Cas protein is a Cas9 protein. In some embodiments, the Cas9 protein is a streptococcus pneumoniae, streptococcus pyogenes, or streptococcus thermophilus Cas9, and may include a mutated Cas9 derived from these organisms. The protein may be a Cas9 homolog or ortholog. In some embodiments, the Cas protein is codon optimized for expression in a eukaryotic cell. In some embodiments, the Cas protein directs cleavage of one or both strands at the target sequence position. In a further aspect of the invention, the expression of the gene product is reduced and the gene product is a protein. The invention includes that the introduction into the cell is via a delivery system which may comprise viral particles, liposomes, electroporation, microinjection or conjugation.
In yet another aspect, the invention provides an engineered programmable non-naturally occurring CRISPR-Cas system, which can comprise a Cas protein and one or more guide RNAs, the one or more guide RNAs in a cell target the genomic locus of a DNA molecule encoding one or more gene products, and the Cas protein cleaves the genomic locus of a DNA molecule encoding the one or more gene products, whereby expression of the one or more gene products is altered or modified; and, wherein the Cas protein and the guide RNAs do not naturally occur together. The invention encompasses that the expression of two or more gene products may be altered or modified. The invention further includes that the guide RNA comprises a guide sequence fused to a tracr sequence. In a preferred embodiment, the cell is a eukaryotic cell, in a more preferred embodiment, the cell is a mammalian cell and in a still more preferred embodiment, the mammalian cell is a human cell. The invention also includes that the CRISPR-Cas system may further comprise one or more NLS. In some embodiments, the Cas protein is a type II CRISPR system enzyme. In some embodiments, the Cas protein is a Cas9 protein. In some embodiments, the Cas9 protein is a streptococcus pneumoniae, streptococcus pyogenes, or streptococcus thermophilus Cas9, and may include a mutated Cas9 derived from these organisms. The protein may be a Cas9 homolog or ortholog. In some embodiments, the Cas protein is codon optimized for expression in a eukaryotic cell. In some embodiments, the Cas protein directs cleavage of one or both strands at the target sequence position. In a further aspect of the invention, the expression of the gene product is reduced and the gene product is a protein. The invention includes that the introduction into the cell is via a delivery system which may comprise viral particles, liposomes, electroporation, microinjection or conjugation.
In one aspect, the invention provides a vector system comprising one or more vectors. In some embodiments, the system comprises: (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for insertion of one or more guide sequences upstream of the tracr mate sequence, wherein the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed to: (1) a guide sequence that hybridizes to the target sequence, and (2) a tracr mate sequence that hybridizes to the tracr sequence; and (b) a second regulatory element operably linked to the enzyme coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence; wherein components (a) and (b) are located on the same or different carriers of the system. In some embodiments, component (a) further comprises a tracr sequence downstream of the tracr mate sequence under the control of the first regulatory element. In some embodiments, component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein each of the two or more guide sequences directs sequence-specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell when expressed. In some embodiments, the system comprises a tracr sequence under the control of a third regulatory element (such as a polymerase III promoter). In some embodiments, the tracr sequence exhibits at least 50%, 60%, 70%, 80%, 90%, 95%, or 99% sequence complementarity along the length of the tracr mate sequence when optimally aligned. Determining the optimal alignment is within the ability of one of ordinary skill in the art. For example, there are published and commercially available alignment algorithms and programs such as, but not limited to, ClustalW, the Smith-Waterman algorithm in matlab (Smith-Waterman), Bowtie, Geneius, Biopython, and SeqMan. In some embodiments, the CRISPR complex comprises one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR complex in a detectable amount in the nucleus of a eukaryotic cell. Without wishing to be bound by theory, it is believed that the nuclear localization sequence is not essential for CRISPR complex activity in eukaryotes, but the inclusion of such sequences enhances the activity of the system, especially for targeting nucleic acid molecules in the nucleus. In some embodiments, the CRISPR enzyme is a type II CRISPR system enzyme. In some embodiments, the CRISPR enzyme is a Cas9 enzyme. In some embodiments, the Cas9 enzyme is streptococcus pneumoniae, streptococcus pyogenes, or streptococcus thermophilus Cas9, and may include a mutated Cas9 derived from these organisms. The enzyme may be a Cas9 homolog or ortholog. In some embodiments, the CRISPR enzyme is codon optimized for expression in a eukaryotic cell. In some embodiments, the CRISPR enzyme directs cleavage of one or both strands at the target sequence position. In some embodiments, the first regulatory element is a polymerase III promoter. In some embodiments, the second regulatory element is a polymerase II promoter. In some embodiments, the guide sequence is at least 15, 16, 17, 18, 19, 20, 25 nucleotides in length, or between 10-30, or between 15-25, or between 15-20 nucleotides in length. Generally, and throughout this specification, the term "vector" refers to a nucleic acid molecule capable of transporting another nucleic acid molecule linked thereto. Vectors include, but are not limited to, single-stranded, double-stranded, or partially double-stranded nucleic acid molecules; nucleic acid molecules comprising one or more free ends, free ends (e.g., circular); nucleic acid molecules comprising DNA, RNA, or both; and other various polynucleotides known in the art. One type of vector is a "plasmid," which refers to a circular double-stranded DNA loop into which additional DNA segments can be inserted, for example, by standard molecular cloning techniques. Another type of vector is a viral vector, in which the virus-derived DNA or RNA sequences are present in a vector for packaging of viruses (e.g., retroviruses, replication-defective retroviruses, adenoviruses, replication-defective adenoviruses, and adeno-associated viruses). Viral vectors also comprise polynucleotides carried by viruses for transfection into a host cell. Certain vectors (e.g., bacterial vectors having a bacterial origin of replication and episomal mammalian vectors) are capable of autonomous replication in a host cell into which they are introduced. Other vectors (e.g., non-episomal mammalian vectors) are integrated into the genome of a host cell upon introduction into the host cell, and thereby are replicated along with the host genome. Moreover, certain vectors are capable of directing the expression of genes to which they are operably linked. Such vectors are referred to herein as "expression vectors". Common expression vectors used in recombinant DNA technology are usually in the form of plasmids.
Recombinant expression vectors may comprise the nucleic acids of the invention in a form suitable for expression of the nucleic acids in a host cell, which means that these recombinant expression vectors comprise one or more regulatory elements selected on the basis of the host cell to be used for expression, which regulatory elements are operably linked to the nucleic acid sequence to be expressed. Within a recombinant expression vector, "operably linked" is intended to mean that the nucleotide sequence of interest is linked to the one or more regulatory elements in a manner that allows for expression of the nucleotide sequence (e.g., in an in vitro transcription/translation system or in a host cell when the vector is introduced into the host cell).
The term "regulatory element" is intended to include promoters, enhancers, Internal Ribosome Entry Sites (IRES), and other EXPRESSION control elements (e.g., transcription termination signals such as polyadenylation signals and polyU sequences), such regulatory sequences are described, for example, IN Goeddel (Goeddel), METHODS of ENZYMOLOGY (GENE EXPRESSION TECHNOLOGY: METHODS IN ENZYMOGY) 185, Academic Press (Academic Press), San Diego, California (1990) the regulatory elements include those which direct constitutive EXPRESSION of a nucleotide sequence IN many types of host cells, and those which direct EXPRESSION of the nucleotide sequence only IN certain host cells (e.g., tissue specific regulatory sequences), tissue specific promoters may direct EXPRESSION IN desired tissues of interest, such as muscle, neuron, bone, skin, blood, specific organ (e.g., liver, pancreas), or Cell type (e.g., Cell type of PPOL specific promoter), such as PPOL specific promoter, or promoter, such as promoter, which may be expressed by a promoter, such as a promoter of a PPOL promoter, as a promoter, such as a promoter, a.
Advantageous vectors include lentiviruses as well as adeno-associated viruses, and this type of vector can also be selected to target a particular type of cell.
In one aspect, the present invention provides a eukaryotic host cell comprising: (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for insertion of one or more guide sequences upstream of the tracr mate sequence, wherein the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed to: (1) a guide sequence that hybridizes to the target sequence, and (2) a tracr mate sequence that hybridizes to the tracr sequence; and/or (b) a second regulatory element operably linked to the enzyme coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence. In some embodiments, the host cell comprises components (a) and (b). In some embodiments, component (a), component (b), or both components (a) and (b) are stably integrated into a genome of the host eukaryotic cell. In some embodiments, component (a) further comprises a tracr sequence downstream of the tracr mate sequence under the control of the first regulatory element. In some embodiments, component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein each of the two or more guide sequences directs sequence-specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell when expressed. In some embodiments, the eukaryotic host cell further comprises a third regulatory element, such as a polymerase III promoter, operably linked to said tracr sequence. In some embodiments, the tracr sequence exhibits at least 50%, 60%, 70%, 80%, 90%, 95%, or 99% sequence complementarity along the length of the tracr mate sequence when optimally aligned. The enzyme may be a Cas9 homolog or ortholog. In some embodiments, the CRISPR enzyme is codon optimized for expression in a eukaryotic cell. In some embodiments, the CRISPR enzyme directs cleavage of one or both strands at the target sequence position. In some embodiments, the CRISPR enzyme lacks DNA strand cleavage activity. In some embodiments, the first regulatory element is a polymerase III promoter. In some embodiments, the second regulatory element is a polymerase II promoter. In some embodiments, the guide sequence is at least 15, 16, 17, 18, 19, 20, 25 nucleotides in length, or between 10-30, or between 15-25, or between 15-20 nucleotides in length. In one aspect, the invention provides a non-human eukaryote; preferably a multicellular eukaryote including a eukaryotic host cell according to any one of the embodiments. In other aspects, the invention provides a eukaryote; preferably a multicellular eukaryote including a eukaryotic host cell according to any one of the embodiments. In some embodiments of these aspects, the organism may be an animal; such as a mammal. In addition, the organism may be an arthropod, such as an insect. The organism may also be a plant. Further, the organism may be a fungus.
In one aspect, the invention provides a kit comprising one or more of the components described herein. In some embodiments, the kit includes a carrier system and instructions for using the kit. In some embodiments, the carrier system comprises: (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for insertion of one or more guide sequences upstream of the tracr mate sequence, wherein the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed to: (1) a guide sequence that hybridizes to the target sequence, and (2) a tracr mate sequence that hybridizes to the tracr sequence; and/or (b) a second regulatory element operably linked to the enzyme coding sequence encoding said CRISPR enzyme comprising a nuclear localization sequence. In some embodiments, the kit comprises components (a) and (b) on the same or different carriers of the system. In some embodiments, component (a) further comprises a tracr sequence downstream of the tracr mate sequence under the control of the first regulatory element. In some embodiments, component (a) further comprises two or more guide sequences operably linked to the first regulatory element, wherein each of the two or more guide sequences directs sequence-specific binding of a CRISPR complex to a different target sequence in a eukaryotic cell when expressed. In some embodiments, the system further comprises a third regulatory element, such as a polymerase III promoter, operably linked to said tracr sequence. In some embodiments, the tracr sequence exhibits at least 50%, 60%, 70%, 80%, 90%, 95%, or 99% sequence complementarity along the length of the tracr mate sequence when optimally aligned. In some embodiments, the CRISPR enzyme comprises one or more nuclear localization sequences of sufficient strength to drive accumulation of said CRISPR enzyme in a detectable amount in the nucleus of a eukaryotic cell. In some embodiments, the CRISPR enzyme is a type II CRISPR system enzyme. In some embodiments, the CRISPR enzyme is a Cas9 enzyme. In some embodiments, the Cas9 enzyme is streptococcus pneumoniae, streptococcus pyogenes, or streptococcus thermophilus Cas9, and may include a mutated Cas9 derived from these organisms. The enzyme may be a Cas9 homolog or ortholog. In some embodiments, the CRISPR enzyme is codon optimized for expression in a eukaryotic cell. In some embodiments, the CRISPR enzyme directs cleavage of one or both strands at the target sequence position. In some embodiments, the CRISPR enzyme lacks DNA strand cleavage activity. In some embodiments, the first regulatory element is a polymerase III promoter. In some embodiments, the second regulatory element is a polymerase II promoter. In some embodiments, the guide sequence is at least 15, 16, 17, 18, 19, 20, 25 nucleotides in length, or between 10-30, or between 15-25, or between 15-20 nucleotides in length.
In one aspect, the invention provides methods of modifying a target polynucleotide in a eukaryotic cell. In some embodiments, the method comprises allowing a CRISPR complex to bind to the target polynucleotide to effect cleavage of said target polynucleotide, thereby modifying the target polynucleotide, wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence that hybridizes to a target sequence within said target polynucleotide, wherein said guide sequence is linked to a tracr mate sequence that in turn hybridizes to a tracr sequence. In some embodiments, said cleaving comprises cleaving one or both strands at the target sequence position by said CRISPR enzyme. In some embodiments, the cleavage results in reduced transcription of the target gene. In some embodiments, the method further comprises repairing the cleaved target polynucleotide by homologous recombination with an exogenous template polynucleotide, wherein the repair results in a mutation comprising an insertion, deletion, or substitution of one or more nucleotides of the target polynucleotide. In some embodiments, the mutation results in one or more amino acid changes in a protein expressed from a gene comprising the target sequence. In some embodiments, the method further comprises delivering one or more vectors to said eukaryotic cell, wherein the one or more vectors drive expression of one or more of: the CRISPR enzyme, a guide sequence linked to the tracr mate sequence, and the tracr sequence. In some embodiments, the vector is delivered into a eukaryotic cell within a subject. In some embodiments, the modification occurs in the eukaryotic cell in cell culture. In some embodiments, the method further comprises isolating the eukaryotic cell from the subject prior to the modifying. In some embodiments, the method further comprises returning said eukaryotic cell and/or cells derived therefrom to said subject.
In one aspect, the invention provides methods of modifying the expression of a polynucleotide in a eukaryotic cell. In some embodiments, the method comprises allowing a CRISPR complex to bind to the polynucleotide such that said binding results in increased or decreased expression of said polynucleotide; wherein the CRISPR complex comprises a CRISPR enzyme complexed to a guide sequence that hybridizes to a target sequence within said polynucleotide, wherein said guide sequence is linked to a tracr mate sequence that in turn hybridizes to a tracr sequence. In some embodiments, the method further comprises delivering one or more vectors to said eukaryotic cell, wherein the one or more vectors drive expression of one or more of: the CRISPR enzyme, a guide sequence linked to the tracr mate sequence, and the tracr sequence.
In one aspect, the invention provides a method of generating a model eukaryotic cell comprising a mutated disease gene. In some embodiments, a disease gene is any gene associated with an increased risk of having or developing a disease. In some embodiments, the method comprises (a) introducing one or more vectors into the eukaryotic cell, wherein the one or more vectors drive expression of one or more of: a CRISPR enzyme, a guide sequence linked to a tracr mate sequence, and a tracr sequence; and (b) allowing a CRISPR complex to bind to a target polynucleotide to effect cleavage of the target polynucleotide within said disease gene, wherein the CRISPR complex comprises a CRISPR enzyme complexed with (1) a guide sequence that hybridizes to the target sequence within the target polynucleotide, and (2) the tracr mate sequence that hybridizes to the tracr sequence, thereby generating a patterned eukaryotic cell comprising a mutated disease gene. In some embodiments, said cleaving comprises cleaving one or both strands at the target sequence position by said CRISPR enzyme. In some embodiments, the cleavage results in reduced transcription of the target gene. In some embodiments, the method further comprises repairing the cleaved target polynucleotide by homologous recombination with an exogenous template polynucleotide, wherein the repair results in a mutation comprising an insertion, deletion, or substitution of one or more nucleotides of the target polynucleotide. In some embodiments, the mutation results in one or more amino acid changes in a protein expressed from a gene comprising the target sequence.
In one aspect, the invention provides a method for developing a bioactive agent that modulates cell signaling events associated with disease genes. In some embodiments, a disease gene is any gene associated with an increased risk of having or developing a disease. In some embodiments, the method comprises (a) contacting a test compound with a model cell of any one of said embodiments; and (b) detecting a change in the readout indicative of a decrease or an increase in a cell signaling event associated with the mutation of the disease gene, thereby developing the bioactive agent that modulates the cell signaling event associated with the disease gene.
In one aspect, the invention provides a recombinant polynucleotide comprising a guide sequence upstream of a tracr mate sequence, wherein the guide sequence, when expressed, directs sequence-specific binding of a CRISPR complex to a corresponding target sequence present in a eukaryotic cell. In some embodiments, the target sequence is a viral sequence present in a eukaryotic cell. In some embodiments, the target sequence is a proto-oncogene or an oncogene.
In one aspect, the invention provides a method of selecting one or more cells by introducing one or more mutations in a gene in the one or more cells, the method comprising: introducing one or more vectors into one or more cells, wherein the one or more vectors drive expression of one or more of: a CRISPR enzyme, a guide sequence linked to a tracr mate sequence, a tracr sequence, and an editing template; wherein the editing template comprises one or more mutations that eliminate a CRISPR enzyme cut; allowing the editing template to homologously recombine with the target polynucleotide in the one or more cells to be selected; allowing binding of a CRISPR complex to a target polynucleotide to effect cleavage of the target polynucleotide within said gene, wherein the CRISPR complex comprises a CRISPR enzyme complexed to (1) a guide sequence that hybridizes to a target sequence within the target polynucleotide, and (2) a tracr mate sequence that hybridizes to the tracr sequence, wherein binding of the CRISPR complex to the target polynucleotide induces cell death, thereby allowing selection of one or more cells into which one or more mutations have been introduced. In some embodiments, the CRISPR enzyme is a type II CRISPR system enzyme. In some embodiments, the CRISPR enzyme is a Cas9 protein. In some embodiments, the Cas9 protein is a streptococcus pneumoniae, streptococcus pyogenes, or streptococcus thermophilus Cas9, and may include a mutated Cas9 derived from these organisms. The enzyme may be a Cas9 homolog or ortholog. In some embodiments, the enzyme is codon optimized for expression in eukaryotic cells. In some embodiments, the enzyme directs cleavage of one or both strands at the location of the target sequence. In a preferred embodiment, the CRISPR enzyme is Cas 9. In another preferred embodiment of the invention, the cell to be selected may be a eukaryotic cell. Aspects of the invention allow for the selection of specific cells without the need for a selection marker or a two-step process that may include a counter-selection system.
Aspects of the invention include site-specific gene knockouts in endogenous genomes: the present invention is advantageous over the use of site-specific nuclease technology based on zinc fingers and TAL effectors because it does not require exhaustive design and can be used to knock out multiple genes within the same genome simultaneously. In a further aspect, the invention includes site-specific genome editing. The present invention is advantageous over the use of natural or artificial site-specific nucleases or recombinases because it may be capable of introducing site-specific double-strand breaks to facilitate homologous recombination at targeted genomic loci. In another aspect, the invention includes DNA sequence specific interference. The present invention can be used to inactivate the genome of harmful DNA-based organisms (such as microorganisms, viruses or even cancer cells) by introducing breaks directly at specific sites in the genome of these organisms. The present invention provides methods and compositions for multiplex genome engineering, as the CRISPR-Cas system of the invention can easily target multiple sites in the genome by using multiple sequence-specific CRISPR spacer elements or guide sequences.
It is therefore an object of the present invention to not cover any previously known products, processes for making such products, or methods of using such products in the present invention, such that applicants reserve and hereby disclose a right to waive any previously known products, processes, or methods. It is further noted that, within the scope of the present invention, the present invention is not intended to cover any product, process, or method of making or using such product which does not comply with the written description and enforceability requirements of the USPTO (35u.s.c. § 112, first paragraph) or EPO (clause 83 of EPC), such that the applicant reserves and hereby discloses the right to disclaim any previously described product, process of making such product, or method of using such product.
It should be noted that in this disclosure and especially in the claims and/or paragraphs, terms such as "comprising," "comprises," "comprising," and the like may have the meaning attributed to it in U.S. patent law; for example, they may represent "include", "included", "including", etc.; and terms such as "consisting essentially of … … (of) and" consisting essentially of … … (of) "have the meaning ascribed to them in U.S. patent law, e.g., they allow elements not expressly recited but exclude elements found in the prior art or affecting the basic or novel features of the invention. These and other embodiments are disclosed in, or are apparent from and encompassed by, the following detailed description.
The invention also relates to the following items:
item 1. a method of altering the expression of one or more gene products, the method comprising introducing into a cell comprising and expressing DNA molecules encoding the one or more gene products an engineered non-naturally occurring CRISPR-Cas system comprising a Cas protein and one or more guide RNAs which target the DNA molecules, whereby the one or more guide RNAs target the genomic loci of the DNA molecules encoding the one or more gene products and the Cas protein cleaves the genomic loci of the DNA molecules encoding the one or more gene products, whereby the expression of the one or more gene products is altered; and, wherein the Cas protein and the guide RNA do not naturally occur together.
Item 2. a method of altering the expression of one or more gene products, the method comprising introducing into a cell containing and expressing a DNA molecule encoding the one or more gene products an engineered, non-naturally occurring vector system comprising one or more vectors comprising:
a) a first regulatory element operably linked to one or more CRISPR-Cas system guide RNAs that hybridize to a target sequence in a genomic locus of a DNA molecule encoding the one or more gene products,
b) a second regulatory element operably linked to a Cas protein,
wherein components (a) and (b) are located on the same or different supports of the system,
whereby the guide RNAs target the genomic locus of the DNA molecule encoding the one or more gene products and the Cas protein cleaves the genomic locus of the DNA molecule encoding the one or more gene products, whereby expression of the one or more gene products is altered; and, wherein the Cas protein and the guide RNAs do not naturally occur together.
Item 3. the method of item 1 or item 2, wherein the expression of two or more gene products is altered.
Item 4. the method of any preceding item, wherein the vector or Cas protein of the system further comprises one or more NLS.
Item 5. the method of any preceding item, wherein the guide RNAs comprise a guide sequence fused to a tracr sequence.
Item 6. the method of any preceding item, wherein the cell is a eukaryotic cell.
Item 7 the method of item 6, wherein the eukaryotic cell is a mammalian cell.
Item 8. the method of item 7, wherein the mammalian cell is a human cell.
Item 9. the method of any above item, wherein the Cas protein is a Cas9 protein.
Item 10. the method of any above item, wherein the Cas protein is codon optimized for expression in a eukaryotic cell.
Item 11. the method of any preceding item, wherein the expression of the gene product is reduced.
Item 12 the method of any preceding item, wherein the gene product is a protein.
Item 13. the method of any preceding item, wherein introducing into the cell is via a delivery system comprising a viral particle, liposome, electroporation, microinjection, or conjugation.
Item 14. an engineered, non-naturally occurring vector system, the vector system comprising one or more vectors, the one or more vectors comprising:
a) a first regulatory element operably linked to one or more CRISPR-Cas system guide RNAs that hybridize to a target sequence in a genomic locus of a DNA molecule encoding one or more gene products,
b) a second regulatory element operably linked to a Cas protein,
wherein components (a) and (b) are located on the same or different supports of the system,
whereby the guide RNAs target the genomic locus of the DNA molecule encoding the one or more gene products in the cell and the Cas protein cleaves the genomic locus of the DNA molecule encoding the one or more gene products, whereby expression of the one or more gene products is altered; and, wherein the Cas protein and the guide RNAs do not naturally occur together.
An engineered, programmable, non-naturally occurring CRISPR-Cas system, comprising a Cas protein and one or more guide RNAs that target a genomic locus of a DNA molecule encoding one or more gene products in a cell, and that cleave the genomic locus of the DNA molecule encoding the one or more gene products, whereby expression of the one or more gene products is altered; and, wherein the Cas protein and the guide RNAs do not naturally occur together.
Item 16 the system of item 14 or 15, wherein the expression of two or more gene products is altered.
Item 17. the system of any one of items 14 to 16, wherein the system further comprises one or more NLSs.
Item 18. the system of any one of items 14 to 17, wherein the guide RNAs comprise a guide sequence fused to a tracr sequence.
Item 19. the system of any one of items 14 to 18, wherein the cell is a eukaryotic cell.
Item 20 the system of item 19, wherein the eukaryotic cell is a mammalian cell.
Item 21 the system of item 20, wherein the mammalian cell is a human cell.
Item 22 the system of any of items 14 to 21, wherein the CRISPR-Cas system is a type II CRISPR-Cas system.
Item 23 the system of any one of items 14 to 22, wherein the Cas protein is a Cas9 protein.
Item 24. the system of any one of items 14 to 23, wherein the Cas protein is codon optimized for expression in a eukaryotic cell.
Item 25. the system of any one of items 14 to 24, wherein the expression of the gene product is reduced.
Item 26. the system of any one of items 14 to 25, wherein the gene product is a protein.
Item 27. the system of any one of items 14 to 26, wherein the system is introduced into the cell via a delivery system comprising a viral particle, a liposome, electroporation, microinjection, or conjugation.
Brief description of the drawings
The novel features believed characteristic of the invention are set forth with particularity in the appended claims. A better understanding of the features and advantages of the present invention will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the invention are utilized, and the accompanying drawings of which:
fig. 1 shows a schematic model of the CRISPR system. Cas9 nuclease from streptococcus pyogenes (yellow) was targeted to genomic DNA via synthetic guide RNA (sgrna) comprising a20 nt guide sequence (blue) and a scaffold (red). The guide sequence base pair to the DNA target (blue) is directly upstream of the essential 5' -NGG protospacer adjacent motif (PAM; magenta), and Cas9 mediates Double Strand Breaks (DSB) approximately 3bp upstream of the PAM (red triangle).
Fig. 2A-F show the results of an exemplary CRISPR system, a possible mechanism of action, an exemplary adaptive alteration of expression in eukaryotic cells, and assays to assess nuclear localization and CRISPR activity. FIG. 2C discloses SEQ ID NOS 23-24 in order of appearance, respectively. FIG. 2E discloses SEQ ID NOS 25-27 in order of appearance, respectively. FIG. 2F discloses SEQ ID NOS 28-32 in order of appearance, respectively.
Fig. 3A-D show the results of an assessment of SpCas9 specificity for exemplary targets. FIG. 3A discloses SEQ ID NOS 33, 26 and 34-44 in order of appearance, respectively. FIG. 3C discloses SEQ ID NO 33.
FIGS. 4A-G show an exemplary vector system and its results of use in directing homologous recombination in eukaryotic cells. FIG. 4E discloses SEQ ID NO 45. FIG. 4F discloses SEQ ID NOS 46-47 in order of appearance, respectively. FIG. 4G discloses SEQ ID NOS 48-52 in order of appearance, respectively.
Fig. 5 provides a table of protospacer sequences ( SEQ ID NOS 16, 15, 14, 53-58, 18, 17, and 59-63, respectively, in order of occurrence) and summarizes the modification efficiency results for protospacer targets designed based on exemplary streptococcus pyogenes and streptococcus thermophilus CRISPR systems with corresponding PAMs against loci in the human and mouse genomes. Cells were transfected with Cas9 and pre-crRNA/tracrRNA or chimeric RNA and analyzed 72 hours after transfection. Based on the results of Surveyor analysis from the indicator cell lines, the indel (indel) percentage was calculated (N ═ 3 for all protospacer targets, error s.e.m., n.d. indicates no detection using Surveyor assay, and n.t. indicates no detection in this study).
Fig. 6A-C show a comparison of different tracrRNA transcripts for Cas 9-mediated gene targeting. FIG. 6A discloses SEQ ID NOS 64-65 in order of appearance, respectively.
FIG. 7 shows a schematic of the surveyed surveyor nuclease assay for double strand break induced micro-insertions and micro-deletions.
Fig. 8A-B show exemplary bicistronic expression vectors for expression of CRISPR system elements in eukaryotic cells. FIG. 8A discloses SEQ ID NOS66-68 in order of appearance, respectively. FIG. 8B discloses SEQID NOS 69-71 in order of appearance.
FIGS. 9A-C show histograms of distances in the human genome between adjacent S.pyogenes SF370 at position 1PAM (NGG) (FIG. 9A) and S.thermophilus LMD9 at position 2PAM (NNAGAAW) (FIG. 9B), and distances per PAM for chromosomes (Chr) (FIG. 9C).
Fig. 10A-D show the results of an exemplary CRISPR system, an exemplary adaptive alteration to expression in eukaryotic cells, and assays to assess CRISPR activity. FIG. 10B discloses SEQ ID NOS 72-73 in order of appearance, respectively. FIG. 10C discloses SEQ ID NO 74.
Fig. 11A-C show exemplary manipulations of CRISPR systems for targeting genomic loci in mammalian cells. FIG. 11A discloses SEQ ID NO 75. FIG. 11B discloses SEQ ID NOS 76-78 in order of appearance, respectively.
FIGS. 12A-B show the results of Northern blot analysis of crRNA processing in mammals. FIG. 12A discloses SEQ ID NO: 79.
Figures 13A-B show exemplary selections of protospacer in human PVALB and mouse Th loci. FIG. 13A discloses SEQ ID NO: 80. FIG. 13B discloses SEQ ID NO 81.
Figure 14 shows an exemplary protospacer and corresponding PAM sequence targets of the streptococcus thermophilus CRISPR system in the human EMX1 locus. FIG. 14 discloses SEQ ID NO 74.
FIG. 15 provides a sequence listing of primers and probes for Surveyor, RFLP, genomic sequencing, and Northern blot analysis (SEQ ID NOS82-93, respectively, in order of occurrence).
Fig. 16A-C show the results of exemplary manipulations of CRISPR systems with chimeric RNAs and surfeyor analysis of systemic activity in eukaryotic cells. FIG. 16A discloses SEQ ID NO 94.
Figures 17A-B show graphical representations of the results of SURVEYOR analysis of CRISPR system activity in eukaryotic cells.
Fig. 18 shows an exemplary visualization of some streptococcus pyogenes Cas9 target sites in the human genome using the UCSC genome browser. FIG. 18 discloses SEQ ID NOS 95-173 in order of appearance.
Fig. 19A-D show a circular depiction of a phylogenetic analysis revealing five Cas9 families, including three large groups of Cas9 (about 1400 amino acids) and two small groups of Cas9 (about 1100 amino acids).
Fig. 20A-F show linear depictions of phylogenetic analyses revealing five Cas9 families, including three large groups of Cas9 (about 1400 amino acids) and two small groups of Cas9 (about 1100 amino acids).
FIGS. 21A-D show genome editing via homologous recombination. (a) Schematic representation of SpCas9 nickase, with the D10A mutation in the RuvC I catalytic domain. (b) Schematic representation of Homologous Recombination (HR) at the human EMX1 locus using sense or antisense single stranded oligonucleotides as repair templates. The upper red arrow indicates the sgRNA cleavage site; PCR primers used for genotyping (tables J and K) are indicated as arrows in the right panel. FIG. 21C discloses SEQ ID NOS 174-176, 174, 177, and 176, respectively, in order of appearance. (c) The sequence of the region modified by HR. D, SURVEYOR analysis of indels at EMX1 target locus mediated by wildtype (wt) and nickase (D10A) SpCas9 (n ═ 3). Arrows indicate the location of the expected fragment size.
Fig. 22A-B show a single vector design for SpCas 9. FIG. 22A discloses SEQID NOS 178-180 in order of appearance, respectively. FIG. 22B discloses SEQ ID NO 181.
The figures herein are for illustrative purposes only and are not necessarily drawn to scale.
Detailed description of the invention
The terms "polynucleotide", "nucleotide sequence", "nucleic acid" and "oligonucleotide" are used interchangeably. They refer to a polymeric form of nucleotides of any length, either deoxyribonucleotides or ribonucleotides, or analogs thereof. The polynucleotide may have any three-dimensional structure and may perform any function, known or unknown. The following are non-limiting examples of polynucleotides: coding or non-coding regions of a gene or gene fragment, multiple loci (one locus) defined according to ligation analysis, exons, introns, messenger RNA (mrna), transfer RNA, ribosomal RNA, short hairpin RNA (shrna), micro-RNA (mirna), ribozymes, cDNA, recombinant polynucleotides, branched polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes, and primers. A polynucleotide may comprise one or more modified nucleotides, such as methylated nucleotides and nucleotide analogs. Modification of the nucleotide structure, if present, may be performed before or after assembly of the polymer. The sequence of nucleotides may be interrupted by non-nucleotide components. The polynucleotide may be further modified after polymerization, such as by conjugation with a labeled moiety.
In various aspects of the invention, the terms "chimeric RNA," "chimeric guide RNA," "single guide RNA," and "synthetic guide RNA" are used interchangeably and refer to a polynucleotide sequence that includes a guide sequence, a tracr sequence, and a tracr mate sequence. The term "guide sequence" refers to a sequence of about 20bp within a guide RNA that specifies a target site, and may be used interchangeably with the terms "guide" or "spacer". The term "tracr mate sequence" may also be used interchangeably with the term "direct repeat(s)". An exemplary CRISPR-Cas system is shown in figure 1.
The term "wild-type" as used herein is a term understood by those skilled in the art and denotes a typical form of an organism, strain, gene or a characteristic that distinguishes it from a mutant or variant form when it exists in nature.
The term "variant" as used herein should be understood to mean a presentation having properties derived from a pattern occurring in nature.
The terms "non-naturally occurring" or "engineered" are used interchangeably and are subject to artificial participation. These terms, when referring to a nucleic acid molecule or polypeptide, mean that the nucleic acid molecule or polypeptide is at least substantially free from at least one other component with which it is associated in nature or as found in nature.
"complementarity" refers to the ability of a nucleic acid to form one or more hydrogen bonds with another nucleic acid sequence by means of conventional Watson-Crick or other unconventional types. Percent complementarity refers to the percentage of residues (e.g., 5, 6,7, 8, 9, 10 out of 10 are 50%, 60%, 70%, 80%, 90%, and 100% complementary) in a nucleic acid molecule that can form hydrogen bonds (e.g., watson-crick base pairing) with a second nucleic acid sequence. "completely complementary" means that all consecutive residues of one nucleic acid sequence hydrogen bond with the same number of consecutive residues in a second nucleic acid sequence. As used herein, "substantially complementary" refers to a degree of complementarity of at least 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99%, or 100% over a region of 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 35, 40, 45, 50 or more nucleotides, or to two nucleic acids that hybridize under stringent conditions.
"stringent conditions" for hybridization, as used herein, refer to conditions under which a nucleic acid having complementarity to a target sequence predominantly hybridizes to the target sequence and does not substantially hybridize to non-target sequences. Stringent conditions are generally sequence dependent and vary depending on a number of factors. In general, the longer the sequence, the higher the temperature at which the sequence specifically hybridizes to its target sequence. Non-limiting examples of stringent conditions are described In Tijssen (1993) Laboratory technology In biochemistry and Molecular Biology-Nucleic Acid Probe Hybridization (Laboratory Techniques In biochemistry-Hybridization With Nucleic Acid Probes), section I, chapter II, "brief description of Hybridization principles and Nucleic Acid Probe analysis strategy" ("Overview of Hybridization and Hybridization analysis of Nucleic Acid probe assay"), Emei (Elissevier), New York.
"hybridization" refers to a reaction in which one or more polynucleotides react to form a complex that is stabilized via hydrogen bonding of bases between the nucleotide residues. Hydrogen bonding can occur by means of watson-crick base pairing, Hoogstein binding, or in any other sequence specific manner. The complex may comprise two strands forming a duplex, three or more strands forming a multi-stranded complex, a single self-hybridizing strand, or any combination of these. The hybridization reaction may constitute a step in a broader process, such as the initiation of PCR, or the cleavage of a polynucleotide by an enzyme. Sequences that are capable of hybridizing to a given sequence are referred to as "complements" of the given sequence.
As used herein, "expression" refers to the process by which a polynucleotide is transcribed from a DNA template (e.g., into mRNA or other RNA transcript) and/or the process by which transcribed mRNA is subsequently translated into a peptide, polypeptide, or protein. The transcripts and encoded polypeptides may be collectively referred to as "gene products". If the polynucleotide is derived from genomic DNA, expression may include splicing of mRNA in eukaryotic cells.
The terms "polypeptide," "peptide," and "protein" are used interchangeably herein to refer to a polymer of amino acids of any length. The polymer may be linear or branched, it may comprise modified amino acids, and it may be interrupted by non-amino acids. These terms also encompass amino acid polymers that have been modified; such as disulfide bond formation, glycosylation, lipidation (phosphorylation), acetylation, phosphorylation, or any other manipulation, such as conjugation to a labeling component. The term "amino acid" as used herein includes natural and/or unnatural or synthetic amino acids, including glycine as well as D and L optical isomers, as well as amino acid analogs and peptidomimetics.
The terms "subject", "individual" and "patient" are used interchangeably herein to refer to a vertebrate, preferably a mammal, more preferably a human. Mammals include, but are not limited to, murines, monkeys, humans, farm animals, sport animals, and pets. Also included are tissues, cells and progeny thereof of a biological entity obtained in vivo or cultured in vitro.
The terms "therapeutic agent", "therapeutically useful agent" or "treatment agent" are used interchangeably and refer to a molecule or compound that imparts a beneficial effect when administered to a subject. The beneficial effects include implementation of a diagnostic determination; ameliorating a disease, symptom, disorder, or pathological condition; reducing or preventing the onset of a disease, symptom, disorder, or condition; and generally against a disease, symptom, disorder, or pathological condition.
As used herein, "treatment" or "treating" or "alleviating" or "improving" are used interchangeably. These terms refer to a route for obtaining a beneficial or desired result, including but not limited to a therapeutic benefit and/or a prophylactic benefit. By therapeutic benefit is meant any therapeutically relevant improvement in or effect on one or more diseases, conditions, or symptoms in treatment. For prophylactic benefit, the composition can be administered to a subject at risk of developing a particular disease, condition, or symptom, or to a subject reporting one or more physiological symptoms of a disease, although the disease, condition, or symptom may not have been manifested.
The term "effective amount" or "therapeutically effective amount" refers to an amount of an agent sufficient to achieve a beneficial or desired result. The therapeutically effective amount may vary depending on one or more of the subject and disease condition being treated, the weight and age of the subject, the severity of the disease condition, the mode of administration, and the like, and can be readily determined by one of ordinary skill in the art. The term also applies to a dose that provides an image for detection by any of the imaging methods described herein. The specific dosage may vary depending on one or more of the following: the particular agent selected, the dosing regimen followed, whether or not it is administered in combination with other compounds, the time of administration, the tissue to be imaged, and the physical delivery system that carries it.
The practice of the present invention employs, unless otherwise indicated, conventional techniques of immunology, biochemistry, chemistry, molecular biology, microbiology, cell biology, genomics and recombinant DNA, which are within the skill of the art. See Sambrook (Sambrook), friech (Fritsch) and mani-tius (manitis), molecular cloning: a LABORATORY Manual (Molecular CLONING: A Laboratory Manual), 2 nd edition (1989); a Current Manual of MOLECULAR BIOLOGY experiments (Current PROTOCOLS IN MOLECULAR BIOLOGY BIOLOGY) (edited by F.M. Otsubel et al, (1987)); METHODS IN ENZYMOLOGY (METHODS IN Enzymology) series (academic Press): PCR 2: practical methods (PCR 2: A PRACTICALAPPROACH) (M.J. Mefferson (M.J. MacPherson), B.D. Nimes (B.D. Hames) and G.R. Taylor (G.R. Taylor) editions (1995)), Harlow (Harlow) and Ladies (Lane) editions (1988) antibodies: a LABORATORY Manual (ANTIBODIES, A LABORATORY MANUAL), and animal cell CULTURE (ANIMAL CELL CURTURE) (edited by R.I. Freyrnib (R.I. Freshney) (1987)).
Aspects of the invention relate to a vector system comprising one or more vectors, or the vectors themselves. The vectors can be designed for expression of CRISPR transcripts (e.g., nucleic acid transcripts, proteins, or enzymes) in prokaryotic or eukaryotic cells. For example, CRISPR transcripts can be expressed in bacterial cells such as e.coli, insect cells (using baculovirus expression vectors), yeast cells, or mammalian cells. Suitable host cells are further discussed in Goeddel, gene expression technology: METHODS IN ENZYMOLOGY (GENE EXPRESSION TECHNOLOGY: METHOD IN ENZYMOLOGY)185, Academic Press (Academic Press), San Diego, Calif. (1990). Alternatively, the recombinant expression vector can be transcribed and translated in vitro, for example, using T7 promoter regulatory sequences and T7 polymerase.
The vector can be introduced into a prokaryote and propagated therein. In some embodiments, prokaryotes are used to amplify multiple copies of a vector to be introduced into eukaryotic cells, or as an intermediate vector in the production of a vector to be introduced into eukaryotic cells (e.g., to amplify a plasmid as part of a viral vector packaging system). In some embodiments, prokaryotes are used to amplify multiple copies of a vector and express one or more nucleic acids, such as to provide a source of one or more proteins for delivery to a host cell or host organism. Expression of proteins in prokaryotes is most often carried out in E.coli using vectors containing constitutive or inducible promoters directing the expression of either fusion or non-fusion proteins. Fusion vectors add multiple amino acids to the protein encoded therein, such as the amino terminus of the recombinant protein. Such fusion vectors can be used for one or more purposes, such as: (i) increasing expression of the recombinant protein; (ii) increasing the solubility of the recombinant protein; and (iii) aid in the purification of the recombinant protein by acting as a ligand in affinity purification. Typically, in fusion expression vectors, a protein cleavage site is introduced at the junction of the fusion moiety and the recombinant protein to enable separation of the recombinant protein from the fusion moiety after purification of the fusion protein. Such enzymes and their cognate recognition sequences include factor Xa, thrombin, and enterokinase. Exemplary fusion expression vectors include pGEX (Pharmacia Biotech Inc.; Smith and Johnson, 1988, Gene (Gene)67:31-40), pMAL (New England Biolabs, Beverly, Mass.), and pRIT5 (Pharmacia, Piscataway, N.J.) which respectively fuse glutathione S-transferase (GST), maltose E binding protein, or protein A to a target recombinant protein.
Examples of suitable inducible non-fusion E.coli EXPRESSION vectors include pTrc (Amran et al, (1988) Gene 69:301-315) and pET 11d (Studier et al, Gene EXPRESSION TECHNOLOGY: METHODS of ENZYMOLOGY (GENE EXPRESSION TECHNOLOGY: METHODS IN ENZYMOLOGY)185, Academic Press, San Diego, Calif. (1990) 60-89.
In some embodiments, the vector is a yeast expression vector. Examples of vectors for expression in Saccharomyces cerevisiae include pYepSec1 (Baldari et al, 1987. J.Eur. Mol. Biol.Soc. (EMBO J)6: 229. 234), pMFa (Kurjan) and Herskowitz (Herskowitz), 1982. Cell (Cell)30: 943), pJRY88 (Schultz et al, 1987. Gene (Gene)54: 113), pYES2(Invitrogen corporation, Invitrogen 933., San Diego, Calif.), and picZ (Invitrogen Corp, San Diego, Calif.).
In some embodiments, baculovirus vectors are used, which drive protein expression in insect cells. Baculovirus vectors that can be used for protein expression in cultured insect cells (e.g., SF9 cells) include the pAc series (Smith et al, 1983, molecular cell biology (mol. cell. biol.)3:2156-2165) and the pVL series (Lacknau (Lucklow) and samos (Summers), 1989, Virology (Virology)170: 31-39).
In some embodiments, a mammalian expression vector is used that is capable of driving expression of one or more sequences in a mammalian cell. Examples of mammalian expression vectors include pCDM8 (Seed, 1987, Nature 329:840) and pMT2PC (Kaufman et al, 1987, journal of the European society for molecular biology 6: 187-195). When used in mammalian cells, the control functions of the expression vector are typically provided by one or more regulatory elements. For example, commonly used promoters are derived from polyoma, adenovirus 2, cytomegalovirus, monkey virus 40, and other viruses described herein and known in the art. For other suitable expression systems for both prokaryotic and eukaryotic cells see, for example, Chapter 16 and 17 of Molecular Cloning, A Laboratory Manual (2 nd edition), Cold Spring Harbor Laboratory (Cold Spring Harbor Laboratory), Cold Spring Harbor Laboratory Press (Cold Spring Harbor Laboratory Press), Cold Spring Harbor (Cold Spring Harbor), N.Y., 1989, by Sambrook et al.
In some embodiments, the recombinant mammalian expression vector is capable of directing expression of a nucleic acid preferentially in a particular Cell type (e.g., using tissue-specific regulatory elements for expression of the nucleic acid). non-limiting examples of suitable tissue-specific promoters include the albumin promoter (liver-specific; Pinkert (Pinkert) et al, (1987) Gene development (Genes Dev.)1:268-277), lymph-specific promoters (Calamee) and Eaton (Eaton), 1988, Immunol evolution (Adv. Immunol)43:235-275), particularly promoters of T-Cell receptors (Winto. and Baltimore (Baltimore), 1989, Eur. Biol. Sci. J. 8:729-733) and immunoglobulins (Banner. J. Sci., Eur. J. 8:729-733) and immunoglobulin (Bannee. J. 264; U.S.P. Pat. No. 1989) 120. 19835; and U.S.S.A. Pat. No. 1987) 7, U.S. Able et al., USA, U.S. 7, U.S. Pat. No. 23, USA, (Acan., USA; 9; USA; 9; USA; 35; USA; 9; USA; 9; USA; 9; USA; 9; USA.
In some embodiments, the regulatory element is operably linked to one or more elements of the CRISPR system, thereby driving expression of the one or more elements of the CRISPR system. In general, CRISPRs (regularly interspaced short palindromic repeats), also known as spiders (spicer-interspaced syntactical repeats), constitute a family of DNA loci that are generally specific for a particular bacterial species. The CRISPR locus comprises a distinct class of spaced-apart Short Sequence Repeats (SSRs) that are recognized in E.coli (Ishino et al, J.Bacteriol., 169: 5429-3533 [1987], Zhongtian (Nakata) et al, J.Bacteriol., 171:3553-3556[1989]), and related genes. Similar spaced-apart SSRs have been identified in Haloferax mediterranei (Haloferax mediterranei), Streptococcus pyogenes, Anabaena, and Mycobacterium tuberculosis (see, Groenen et al, molecular microbiology (mol. Microbiol.), 10: 1057-. These CRISPR loci are typically distinct from the repetitive structures of other SSRs, which repeats have been called regularly spaced short repeats (SRSR) (Jansen (Janssen) et al, OMICS: journal of Integrated biology (OMICS J. Integ. biol.), 6:23-33[2002], and Morgeka (Mojica) et al, molecular microbiology (mol. Microbiol.), 36:244-246[2000 ]). Generally, these repeats are short elements in clusters that are regularly spaced by unique intervening sequences of substantially constant length (moglica et al [2000], supra). Although the repeat sequences are highly conserved among strains, many spaced repeats and the sequences of these spacers generally differ from strain to strain (von Embden et al, J. Bacteriol., 182:2393-2401[2000 ]). CRISPR loci have been identified in more than 40 prokaryotes (see, e.g., Jansen (Janssen) et al, molecular microbiology (mol. Microbiol.), 43: 1565-: aeropyrum (Aeropyrum), Pyrobaculum (Pyrobaculum), Sulfolobus (Sulfolobus), Archaeoglobus (Archaeoglobus), Halofenphaem (Halocarcula), Methanobacterium (Methanobacterium), Methanococcus (Methanococcus), Methanosarcina (Methanosarcina), Methanopyrum (Methanopyrum), Pyrococcus (Pyrococcus), Acidophilus (Picrophilus), Thermoplasma (Thermoplasma), Corynebacterium (Corynebacterium), Mycobacterium (Streptomyces), Streptomyces (Streptomyces), Aquifex (Aquifex), Porphyromonas (Porphyromonas), Chlorobacterium (Chlorobium), Thermus (Thermus), Bacillus (Bacillus), Listeria (Staphylococcus), Staphylococcus (Thermococcus), Thermococcus (Thermococcus), Clostridium (Clostridium), Thermomyces), Clostridium (Clostridium), Clostridium (Thermus), Thermus (Bacillus), Bacillus (Bacillus) and Bacillus (Bacillus) bacteria, Pseudomonas) are used in the genus of Bacillus (Bacillus, Bacillus (Bacillus, desulfosulfovibrio (Desulfovibrio), Geobactrum (Geobacter), Myxococcus (Myxococcus), Campylobacter (Campylobacter), Bacteroides (Wolinella), Acinetobacter (Acinetobacter), Erwinia (Erwinia), Escherichia (Escherichia), Legionella (Legionella), Methylococcus (Methylococcus), Pasteurella (Pasteurella), Photobacterium (Photobacterium), Salmonella (Salmonella), Xanthomonas (Xanthomonas), Yersinia (Yersinia), Treponema (Treponema), and Thermotoga (Thermotoga).
In general, the "CRISPR system" is collectively referred to as transcripts and other elements involved in expression of or directing the activity of a CRISPR-associated ("Cas") gene, including sequences encoding a Cas gene, tracr (trans-activating CRISPR) sequences (e.g., tracrRNA or active portions of tracrRNA), tracr mate sequences (encompassing "direct repeats" and partial direct repeats of tracrRNA processing in the context of an endogenous CRISPR system), guide sequences (also referred to as "spacers" in the context of an endogenous CRISPR system), or other sequences and transcripts from CRISPR loci. In some embodiments, one or more elements of the CRISPR system are derived from a type I, type II, or type III CRISPR system. In some embodiments, one or more elements of the CRISPR system are derived from a particular organism comprising an endogenous CRISPR system, such as streptococcus pyogenes. In general, CRISPR systems are characterized by elements that facilitate the formation of a CRISPR complex (also referred to as a pre-spacer in the context of endogenous CRISPR systems) at a site of a target sequence. In the context of CRISPR complex formation, "target sequence" refers to a sequence for which the guide sequence is designed to have complementarity, wherein hybridization between the target sequence and the guide sequence promotes CRISPR complex formation. Complete complementarity is not necessary, provided that sufficient complementarity exists to cause hybridization and promote formation of a CRISPR complex. A target sequence may comprise any polynucleotide, such as a DNA or RNA polynucleotide. In some embodiments, the target sequence is located in the nucleus or cytoplasm of the cell. In some embodiments, the target sequence may be located within an organelle of the eukaryotic cell, such as a mitochondrion or chloroplast. Sequences or templates that can be used to recombine into a target locus that includes the target sequence are referred to as "editing templates" or "editing polynucleotides" or "editing sequences". In aspects of the invention, the exogenous template polynucleotide may be referred to as an editing template. In one aspect of the invention, the recombination is homologous recombination.
Typically, in the context of an endogenous CRISPR system, the formation of a CRISPR complex (comprising a guide sequence that hybridizes to a target sequence and complexes with one or more Cas proteins) results in the cleavage of one or both strands in or near (e.g., within 1, 2,3, 4,5, 6,7, 8, 9, 10, 20, 50, or more base pairs) the target sequence. Without wishing to be bound by theory, the tracr sequence (which may comprise or consist of all or part of a wild-type tracr sequence (e.g., about or more than about 20, 26, 32, 45, 48, 54, 63, 67, 85, or more nucleotides of a wild-type tracr sequence)) may also form part of a CRISPR complex, such as by hybridizing along at least a portion of the tracr sequence to all or part of a tracr mate sequence operably linked to the guide sequence. In some embodiments, the tracr sequence is sufficiently complementary to a tracr mate sequence to hybridize and participate in the formation of a CRISPR complex. As to the target sequence, it is believed that complete complementarity is not required, as long as it is sufficient for functionality. In some embodiments, the tracr sequence has at least 50%, 60%, 70%, 80%, 90%, 95%, or 99% sequence complementarity along the length of the tracr mate sequence when optimally aligned. In some embodiments, one or more vectors that drive expression of one or more elements of the CRISPR system are introduced into a host cell such that expression of the elements of the CRISPR system directs formation of a CRISPR complex at one or more target sites. For example, the Cas enzyme, the guide sequence linked to the tracr mate sequence, and the tracr sequence may each be operably linked to separate regulatory elements on separate vectors. Alternatively, two or more elements expressed from the same or different regulatory elements may be combined in a single vector, wherein one or more additional vectors providing any components of the CRISPR system are not included in the first vector. The CRISPR system elements incorporated in a single vector may be arranged in any suitable orientation, such as with one element located 5 '("upstream") or 3' ("downstream") relative to a second element. The coding sequence for one element may be located on the same strand or on the opposite strand of the coding sequence for the second element and oriented in the same or opposite direction. In some embodiments, a single promoter drives expression of a transcript encoding a CRISPR enzyme and one or more of the guide sequence, tracr mate sequence (optionally operably linked to the guide sequence), and tracr sequence embedded within one or more intron sequences (e.g., each in a different intron, two or more in at least one intron, or all in a single intron). In some embodiments, the CRISPR enzyme, guide sequence, tracr mate sequence, and tracr sequence are operably linked to and expressed from the same promoter. A single vector construct for SpCas9 is shown in figure 22.
In some embodiments, a vector comprises one or more insertion sites, such as restriction endonuclease recognition sequences (also referred to as "cloning sites"). In some embodiments, one or more insertion sites (e.g., about or more than about 1, 2,3, 4,5, 6,7, 8, 9, 10, or more insertion sites) are located upstream and/or downstream of one or more sequence elements of one or more vectors. In some embodiments, a vector comprises an insertion site upstream of a tracr mate sequence, and optionally downstream of a regulatory element operably linked to the tracr mate sequence, such that upon insertion of a guide sequence into the insertion site and upon expression the guide sequence directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell. In some embodiments, a vector comprises one or more insertion sites, each located between two tracr mate sequences, allowing insertion of a guide sequence at each site. In such an arrangement, the two or more guide sequences may comprise two or more copies of a single guide sequence, two or more different guide sequences, or a combination of these. When multiple different guide sequences are used, a single expression construct can be used to target CRISPR activity to multiple different corresponding target sequences within a cell. For example, a single vector may comprise about or more than about 1, 2,3, 4,5, 6,7, 8, 9, 10, 15, 20, or more guide sequences. In some embodiments, about or more than about 1, 2,3, 4,5, 6,7, 8, 9, 10, or more such vectors containing a target sequence can be provided and optionally delivered into a cell.
In some embodiments, one vector comprises a regulatory element operably linked to an enzyme coding sequence encoding a CRISPR enzyme (such as a Cas protein). Non-limiting examples of Cas proteins include: cas1, Cas1B, Cas2, Cas3, Cas4, Cas5, Cas6, Cas7 (also known as Csn 7 and Csx 7), Cas7, Csy 7, Cse 7, Csc 7, Csa 7, Csn 7, Csm 7, Cmr 7, Csb 7, Csx 36x 7, Csx 36f 7, csxf 7, Csx 36f 7, Csx 36x 7, Csx 36x 7, Csx 36x. These enzymes are known; for example, the amino acid sequence of the streptococcus pyogenes Cas9 protein can be found under SwissProt database accession number Q99ZW 2. In some embodiments, an unmodified CRISPR enzyme, such as Cas9, has DNA cleavage activity. In some embodiments, the CRISPR enzyme is Cas9, and may be Cas9 from streptococcus pyogenes or streptococcus pneumoniae. In some embodiments, the CRISPR enzyme directs cleavage of one or both strands at a target sequence position (e.g., within the target sequence and/or within the complement of the target sequence). In some embodiments, the CRISPR enzyme directs the cleavage of one or both strands within about 1, 2,3, 4,5, 6,7, 8, 9, 10, 15, 20, 25, 50, 100, 200, 500, or more base pairs from the first or last nucleotide of the target sequence. In some embodiments, a vector encodes a CRISPR enzyme that is mutated relative to a corresponding wild-type enzyme such that the mutated CRISPR enzyme lacks the ability to cleave one strand and both strands of a target polynucleotide comprising a target sequence. For example, an aspartate to alanine substitution in the RuvC I catalytic domain of Cas9 from streptococcus pyogenes (D10A) converts Cas9 from a two-strand cleaving nuclease to a nickase (cleaving a single strand). Other examples of mutations that render Cas 9a nickase include, without limitation, H840A, N854A, and N863A. In aspects of the invention, the nickase may be used for genome editing via homologous recombination. For example, fig. 21 shows genome editing via homologous recombination. Fig. 21(a) shows a schematic of SpCas9 nickase, with the D10A mutation in the RuvC I catalytic domain. (b) Schematic representation of Homologous Recombination (HR) at the human EMX1 locus using sense or antisense single stranded oligonucleotides as repair templates. (c) The sequence of the region modified by HR. (d) SURVEYOR assay for wild type (wt) and nickase (D10A) SpCas9 mediated indels at EMX1 target locus 1 (n ═ 3). Arrows indicate the location of the expected fragment size.
In some embodiments, a Cas9 nickase can be used in combination with one or more guide sequences, e.g., two guide sequences, which target the sense and antisense strands of the DNA target, respectively. This combination allows both strands to be nicked and used to induce NHEJ. Applicants have demonstrated (data not shown) the efficacy of two nickase targets (i.e., sgrnas that target different strands of DNA at the same position) in inducing mutagenized NHEJ. One single nickase (Cas9-D10A with a single sgRNA) was unable to induce NHEJ and establish indels, but the applicant has shown that a double nickase (Cas9-D10A and two sgrnas targeting different strands at the same position) can do this in human embryonic stem cells (hescs). This efficiency is about 50% nuclease in hescs (i.e., conventional Cas9 without the D10 mutation).
As a further example, two or more catalytic domains of Cas9 (RuvC I, RuvC II, and RuvCIII) may be mutated to Cas9 that produces mutations that substantially lack all DNA cleavage activity. In some embodiments, the D10A mutation is combined with one or more of the H840A, N854A, or N863A mutations in order to produce a Cas9 enzyme that lacks substantially all DNA cleavage activity. In some embodiments, when the DNA cleavage activity of the mutated CRISPR enzyme is about 25%, 10%, 5%, 1%, 0.1%, 0.01%, or less than its non-mutated form, then the enzyme is considered to be substantially devoid of all DNA cleavage activity. Other mutations may be useful; where Cas9 or other CRISPR enzymes are from a species other than streptococcus pyogenes, mutations of the corresponding amino acids can be made to achieve similar effects.
In some embodiments, the enzyme coding sequence encoding a CRISPR enzyme is codon optimized for expression in a particular cell, such as a eukaryotic cell. These eukaryotic cells may be those of or derived from a particular organism, such as a mammal, including but not limited to a human, mouse, rat, rabbit, dog, or non-human primate. In general, codon optimization refers to a method of modifying a nucleic acid sequence so as to enhance expression in a host cell of interest by replacing at least one codon of the native sequence (e.g., about or more than about 1, 2,3, 4,5, 10, 15, 20, 25, 50, or more codons with codons that are used more frequently or most frequently in the host cell's genes while maintaining the native amino acid sequence.different species exhibit a particular preference for certain codons with a particular amino acid.codon preference (difference in codon usage between organisms) is often related to the translation efficiency of messenger rna (mrna) which is believed to be dependent on (among other things) the nature of the codons being translated and the availability of particular transfer rna (tRNA) molecules.a preponderance of a selected tRNA in the cell generally reflects the codons most frequently used for peptide synthesis.A, genes can be tailored for optimal gene expression in a given organism based on codon optimization. Tables of codon usage can be readily obtained, for example in a codon usage Database ("CodonUage Database"), and these tables can be adapted in different ways. See, zhongmura Y (Nakamura Y.) et al, "codon usage tabulated from international DNA sequence databases: state of the year 2000 "(Codonusage blocked from the international DNA sequence databases: status for the year 2000) nucleic acids research (nucleic acids Res.)28:292 (2000). Computer algorithms for codon optimizing a particular sequence for expression in a particular host cell are also available, such as Gene Forge (Aptagen, Inc.; Jacobs (Jacobus), Pa.). In some embodiments, one or more codons (e.g., 1, 2,3, 4,5, 10, 15, 20, 25, 50, or more, or all codons) in the sequence encoding the CRISPR enzyme correspond to the codons most frequently used for a particular amino acid.
In general, a guide sequence is any polynucleotide sequence that is sufficiently complementary to a target polynucleotide sequence to hybridize to the target sequence and to direct sequence-specific binding of a CRISPR complex to the target sequence. In some embodiments, when optimally aligned using a suitable alignment algorithm, the degree of complementarity between the guide sequence and its corresponding target sequence is about or greater than about 50%, 60%, 75%, 80%, 85%, 90%, 95%, 97.5%, 99%, or more. Any suitable algorithm for aligning sequences may be used to determine the optimal alignment, non-limiting examples of which include the Smith-Waterman (Smith-Waterman) algorithm, the nidman-Wunsch (Needleman-Wunsch) algorithm, algorithms based on the Burrows-Wheeler Transform (such as the Burrows-Wheeler alignment tool), ClustalW, Clustal X, BLAT, Novoalign (Novocraft technologies), ELAND (illumana, san diego, ca), net (available in SOAP). In some embodiments, the guide sequence is about or more than about 5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 35, 40, 45, 50, 75, or more nucleotides in length. In some embodiments, a guide sequence is less than about 75, 50, 45, 40, 35, 30, 25, 20, 15, 12, or fewer nucleotides in length. The ability of the guide sequence to direct sequence-specific binding of the CRISPR complex to the target sequence can be assessed by any suitable assay. For example, components of the CRISPR system sufficient to form a CRISPR complex, including the guide sequence to be tested, can be provided into a host cell having the corresponding target sequence, e.g., by transfection with a vector encoding a component of the CRISPR sequence, followed by assessment of preferential cleavage within the target sequence by a measurer assay as described herein. Similarly, cleavage of a target polynucleotide sequence can be assessed in a test tube by providing the target sequence, a component of the CRISPR complex comprising the guide sequence to be tested, and a control guide sequence different from the test guide sequence, and comparing the binding or cleavage rate at the target sequence between reaction of the test guide sequence and the control guide sequence. Other assays are possible and will occur to those skilled in the art.
The guide sequence may be selected to target any target sequence. In some embodiments, the target sequence is a sequence within the genome of the cell. Exemplary target sequences include those that are unique in the target genome. For example, for Streptococcus pyogenes Cas9, a unique target sequence in the genome may include a Cas9 target site of the form MMMMMMMMNNNNNNNNNNXGG, where NNNNNNNNXGG (N is A, G, T, or C; and X may be anything) is a single occurrence in the genome. The unique target sequence in the genome may include the streptococcus pyogenes Cas9 target site of the form mmmmmmmnnnnnnnnnnnxgg, where nnnnnnnnnnxgg (N is A, G, T, or C; and X may be anything) is a single occurrence in the genome. For S.thermophilus CRISPR1 Cas9, the unique target sequence in the genome can include the Cas9 target site of the form MMMMMMMMNNNNNNNNNNXXAGAAW (SEQ ID NO:1), where NNNNNNNNNNNNNNXXAGAAW (SEQ ID NO:2) (N is A, G, T, or C; X can be anything; and W is A or T) occurs a single time in the genome. The unique target sequence in the genome can include the Streptococcus thermophilus CRISPR1 Cas9 target site of the form MMMMMMMNNNNNNNNNXXAGAAW (SEQ ID NO:3), where NNNNNNNNXXAGAAW (SEQ ID NO:4) (N is A, G, T, or C; X can be anything; and W is A or T) is a single occurrence in the genome. For streptococcus pyogenes Cas9, the unique target sequence in the genome may include a Cas9 target site of the form mmmmmmmmnnnnnnnnnnxggxg, where NNNNNNNNNNNNXGGXG (N is A, G, T, or C; and X may be anything) occurs a single time in the genome. The unique target sequence in the genome may include the streptococcus pyogenes Cas9 target site of the form mmmmmmmnnnnnnnnnnnxggxg xgxgxgg, where nnnnnnnnnnnnnnxggxg (N is A, G, T, or C; and X may be anything) occurs a single time in the genome. In each of these sequences, "M" may be A, G, T, or C, and need not be considered unique in sequence identification.
In some embodiments, the guide sequence is selected to reduce the degree of secondary structure within the guide sequence. Secondary structure may be determined by any suitable polynucleotide folding algorithm. Some algorithms are based on calculating the minimum Gibbs (Gibbs) free energy. An example of one such algorithm is mFold, as described in grand (Zuker) and Sttiger (Stiegler) Nucleic Acids research (Nucleic Acids Res.)9(1981), 133-148). Another example of a folding algorithm is the use of an online network server RNAfold (see, e.g., A.R. Gruber (A.R. Gruber) et al, 2008, Cell (Cell)106(1): 23-24; and PA Carr and GM Highett (GMChurch), 2009, Natural Biotechnology (Nature Biotechnology)27(12):1151-62), developed by the Institute for theoretical chemical Chemistry, University of Vienna (University of Vienna). Additional algorithms may be found in U.S. application serial No. 61/836,080 (attorney docket No. 44790.11.2022; bode reference BI-2013/004a), which is incorporated herein by reference.
In general, tracr mate sequences include any sequence having sufficient complementarity to the tracr sequence to facilitate one or more of the following: (1) excision of the guide sequence flanked by tracr mate sequences in cells containing the corresponding tracr sequence; and (2) formation of a CRISPR complex at the target sequence, wherein the CRISPR complex comprises a tracr mate sequence that hybridizes to a tracr sequence. Typically, the degree of complementarity is in terms of the best alignment of the tracr mate sequence with the tracr sequence along the length of the shorter of the two sequences. Optimal alignment can be determined by any suitable alignment algorithm, and secondary structures can be further explained, such as self-complementarity within the tracr sequence or tracr mate sequence. In some embodiments, the degree of complementarity between the tracr sequence and tracr mate sequence along the length of the shorter of the two is about or greater than about 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 97.5%, 99%, or higher when optimally aligned. An example illustration of the optimal alignment between a tracr sequence and a tracr mate sequence is provided in fig. 10B and 11B. In some embodiments, the tracr sequence is about or more than about 5, 6,7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 40, 50, or more nucleotides in length. In some embodiments, the tracr sequence and tracr mate sequence are contained in a single transcript, such that hybridization between the two produces a transcript having secondary structure (e.g., a hairpin). Preferred loop-forming sequences for use in hairpin structures are four nucleotides in length, and most preferably have the sequence GAAA. However, longer or shorter loop sequences may be used, as may alternative sequences. These sequences preferably include a triplet (e.g., AAA), and additional nucleotides (e.g., C or G). Examples of loop forming sequences include CAAA and AAAG. In one embodiment of the invention, the transcript or transcribed polynucleotide sequence has at least two or more hairpins. In preferred embodiments, the transcript has two, three, four or five hairpins. In a further embodiment of the invention, the transcript has at most five hairpins. In some embodiments, the single transcript further comprises a transcription termination sequence; preferably this is a polyT sequence, for example six T nucleotides. An example illustration of such a hairpin structure is provided in the lower part in fig. 11B, where the part of the sequence 5 'of the final "N" and upstream of the loop corresponds to the tracr mate sequence, and the part of the sequence 3' of the loop corresponds to the tracr sequence. Additional non-limiting examples of single polynucleotides comprising a guide sequence, a tracr mate sequence, and a tracr sequence are as follows (listed as5 'to 3'), where "N" represents the base of the guide sequence, the first region in lower case font represents the tracr mate sequence, and the second region in lower case font represents the tracr sequence, and the last poly-T sequence represents the transcription terminator: (1) NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNGTttgtactctcaagatatagtgcagaagctcaaatccaaacacctcgtcattttatggcaggttttcgttatttaTTTTTTTT (SEQ ID NO: 5); (2) NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNgtttttgtactctcaagaaaatgaaggcttcatgcatgccgaatacacacctctctctcgtcattttattaTTGTTTTT (SEQ ID NO: 6); (3) NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNgtttttgtactctcaagaaatggcagagcttcgcatcgaatacacacctctctctctcgtcatttggtggttttttttttt (SEQ ID NO: 7); (4) NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNGTttagagcttagaGAAAtagcagtgctgttatcaacttgaaaaaaagtggctagtcgttggctttttttt (SEQ ID NO: 8); (5) NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNGTttagagcttaGAAATAGcaagttaaataaaaggctagtcgttatcaacttgaaaaagttttttttttt (SEQ ID NO: 9); and (6) NNNNNNNNNNNNNNNNNNNNNNNNgttttagagctagAAATAGcaagttaaataaggctgctcgtttattttttt (SEQ ID NO: 10). In some embodiments, sequences (1) to (3) are used in conjunction with Cas9 from streptococcus thermophilus CRISPR 1. In some embodiments, sequences (4) to (6) are used in conjunction with Cas9 from streptococcus pyogenes CRISPR 1. In some embodiments, the tracr sequence is a separate transcript from the transcript comprising the tracr mate sequence (e.g., as shown in the top portion of fig. 11B).
In some embodiments, the CRISPR enzyme is part of a fusion protein comprising one or more heterologous protein domains (e.g., about or more than about 1, 2,3, 4,5, 6,7, 8, 9, 10, or more domains in addition to the CRISPR enzyme fusion proteins may comprise any other protein, and optionally a linker between any two domains examples of protein domains that may be fused to CRISPR enzymes include, but are not limited to, epitope tags, reporter gene sequences, and protein domains having one or more of the following activities: methylase activity, demethylase activity, transcriptional activation activity, transcriptional repressor activity, transcriptional release factor activity, histone modification activity, RNA cleavage activity, and nucleic acid binding activity non-limiting examples of epitope tags include histidine (His) tag, V5 tag, FLAG G tag, influenza virus Hemagglutinin (HA) tag, Myc tag, VSV-G tag, and thioredoxin (Trx) tag, examples of reporter genes include, without limitation, glutathione-S-transferase (trp) tag, luciferase binding, luciferase.
In one aspect of the invention, a reporter gene can be introduced into a cell to encode a gene product that serves as a marker for measuring changes or modifications in the expression of the gene product, including, but not limited to, glutathione-S-transferase (GST), horseradish peroxidase (HRP), Chloramphenicol Acetyltransferase (CAT), β -galactosidase, β -glucuronidase, luciferase, Green Fluorescent Protein (GFP), HcRed, DsRed, Cyan Fluorescent Protein (CFP), Yellow Fluorescent Protein (YFP), and auto-fluorescent protein (including Blue Fluorescent Protein (BFP)).
In some aspects, the invention provides methods comprising delivering one or more polypeptides to a host cellNucleotides, such as or as one or more vectors described herein, one or more transcripts thereof, and/or one or more proteins transcribed therefrom. The present invention serves as a basic platform that allows targeted modification of DNA-based genomes. It can be conjugated with a variety of delivery systems including, but not limited to, viruses, liposomes, electroporation, microinjection, and conjugation. In some aspects, the invention further provides cells produced by such methods and organisms (e.g., animals, plants, or fungi) comprising or produced by such cells. In some embodiments, the CRISPR enzyme in combination with (and optionally complexed with) a guide sequence is delivered to a cell. Nucleic acids can be introduced into mammalian cells or target tissues using conventional viral and non-viral based gene transfer methods. Such methods can be used to administer nucleic acids encoding components of the CRISPR system to cells in culture or in a host organism. Non-viral vector delivery systems include DNA plasmids, RNA (e.g., transcripts of the vectors described herein), naked nucleic acid, and nucleic acid complexed with a delivery vehicle (e.g., liposomes). Viral vector delivery systems include DNA and RNA viruses that have either episomal or integrative genomes after delivery to a cell. For a review of gene therapy programs, see Anderson (Anderson), Science 256: 808-; nabel (Nabel)&Ferger sodium (Felgner), TIBTECH 11: 211-; corn (Mitani)&Casky, TIBTECH 11:162-166 (1993); dilon (Dillon), TIBTECH 11: 167-; miller (Miller), Nature 357:455-460 (1992); van Brunt, Biotechnology 6(10) 1149-1154 (1988); vene (Vigne), "Restorative neurology and Neuroscience" (Restorative neurology and Neuroscience)8:35-36 (1995); kremer (Kremer)&Perricodet (Perricaudet), British Medical Bulletin 51(1) 31-44 (1995); hada Da (Haddada), et al, Doerfler and Bomller in Current Topics in Microbiology and Immunology (Current Topics in Microbiology and Immunology)
Figure BDA0002377677250000421
(edit) (1995); and Yu (Yu) et al, Gene therapy (Gene therapy)1:13-26 (1994).
Non-viral delivery methods of nucleic acids include lipofection, nuclear transfection, microinjection, gene guns, viral particles, liposomes, immunoliposomes, polycations, or lipids: nucleic acid conjugates, naked DNA, artificial virions, and agents that enhance uptake of DNA. Lipofection is described in, for example, U.S. Pat. Nos. 5,049,386, 4,946,787 and 4,897,355 and lipofection reagents are commercially available (e.g., Transfectam)TMAnd LipofectinTM). Suitable efficient receptor recognition lipofections for polynucleotides include cationic and neutral lipids of Felgner (fergrener), WO 91/17424; those of WO 91/16024. Delivery can be to cells (e.g., in vitro or ex vivo administration) or target tissues (e.g., in vivo administration).
Lipid: the preparation of nucleic acid complexes, including targeted liposomes such as immunoliposome complexes, is well known to those skilled in the art (see, e.g., Kreister (Crystal),. Sci. 270:404-410 (1995); Blazee (Blaese) et al, Cancer Gene Therapy (Cancer Gene Ther.)2:291-297 (1995); Bell (Behr) et al, Bioconjugate chemistry (Bioconjugate Chem.)5:382-389 (1994); Remy) et al, Bioconjugate chemistry 5:647-654 (1994); Gao et al, the Gene Therapy (Gene copy) 2: 710-871722 (1995); Ahmad et al, Cancer research (Cancer Res 52: 4817; 1992) 52: 4817-028, 6757, 4,774,085, 4,946,787, 3683, 4,774,085, 3683; 4,946,787, 4,774,085, 4,946,787, 4,774,085).
Delivery of nucleic acids using RNA or DNA virus based systems takes advantage of a highly evolved process of targeting viruses to specific cells in the body and carrying the viral payload (payload) into the nucleus. The viral vectors can be administered directly to the patient (in vivo) or they can be used to treat cells in vitro, and optionally, the modified cells can be administered to the patient (ex vivo). Conventional viral-based systems may include retroviral vectors, lentiviral vectors, adenoviral vectors, adeno-associated viral vectors and herpes simplex viral vectors for gene transfer. Integration into the host genome is possible using retroviral, lentiviral and adeno-associated viral gene transfer methods, which often results in long-term expression of the inserted transgene. In addition, high transduction efficiencies have been observed in different cell types and target tissues.
The tropism of retroviruses can be altered by the incorporation of foreign envelope proteins, expanding the potential target population of target cells. Lentiviral vectors are retroviral vectors capable of transducing or infecting non-dividing cells and typically producing higher viral titers. Therefore, the choice of retroviral gene transfer system will depend on the target tissue. Retroviral vectors consist of cis-acting long terminal repeats with the ability to package up to 6-10kb of foreign sequences. A minimum amount of cis-acting LTRs is sufficient for replication and packaging of the vectors, which are then used to integrate the therapeutic gene into the target cell to provide permanent transgene expression. Widely used retroviral vectors include those based on murine leukemia virus (MuLV), gibbon ape leukemia virus (GaLV), Simian Immunodeficiency Virus (SIV), Human Immunodeficiency Virus (HIV) and combinations thereof (see, e.g., Buchscher et al, J.Virol et al, 66: 2731-. In applications where transient expression is preferred, an adenovirus-based system may be used. Adenovirus-based vectors are capable of very high transduction efficiency in many cell types and do not require cell division. With such vectors, higher titers and expression levels have been obtained. This vector can be produced in large quantities in a relatively simple system. Cells with target nucleic acids can also be transduced with adeno-associated virus ("AAV") vectors, e.g., for the production of nucleic acids and peptides in vitro, and for in vivo and ex vivo Gene Therapy procedures (see, e.g., Wester (West) et al, Virology 160:38-47(1987), U.S. Pat. No. 4,797,368; WO 93/24641; Kuding (Kotin), "Human Gene Therapy 5:793-801 (1994); Musca (Muzyczka)," J.Clin. Invest.)94:1351 (1994)). The construction of recombinant AAV vectors is described in a number of publications, including U.S. Pat. nos. 5,173,414; trastemin et al, molecular and cell biology (mol.cell.biol.)5:3251-3260 (1985); tritettikin et al, molecular and cellular biology 4: 2072-; elmenatet (Hermonat) & Musca (Muzyczka), & Proc. Natl. Acad. Sci. USA (PNAS)81: 6466-; and Samulsky (Samulski), et al, J.Virol, 63: 03822-containing 3828 (1989).
Packaging cells are typically used to form viral particles capable of infecting host cells. Such cells include 293 cells packaging adenovirus and ψ 2 cells or PA317 cells containing retrovirus. Viral vectors used in gene therapy are typically produced from cell lines that package nucleic acid vectors into viral particles. These vectors typically contain the minimum amount of sequences required for packaging and subsequent integration into the host, with other viral sequences being replaced by expression cassettes for the polynucleotide or polynucleotides to be expressed. Lost viral function is typically provided in trans by the packaging cell line. For example, AAV vectors used in gene therapy typically have only ITR sequences from the AAV genome that are required for packaging and integration into the host genome. Viral DNA is packaged into a cell line that contains the other AAV genes encoding helper plasmids, rep and cap, but lacks ITR sequences. The cell line may also be infected with adenovirus as a helper. The helper virus promotes replication of the AAV vector and expression of the AAV gene from the helper plasmid. Due to the lack of ITR sequences, the helper plasmid was not packaged in significant quantities. Contamination with adenovirus can be reduced by, for example, heat treatment that makes adenovirus more sensitive than AAV. Additional methods for delivering nucleic acids to cells are known to those of skill in the art. See, for example, US 20030087817, incorporated herein by reference.
In some embodiments, the host cell is transiently or non-transiently transfected with one or more of the vectors described herein. In some embodiments, the cells are transfected when they are naturally present in the subject. In some embodiments, the transfected cells are taken from a subject. In some embodiments, the cell is derived from a cell taken from the subject, such as a cell line. A wide variety of cell lines for tissue culture are known in the art. Examples of cell lines include, but are not limited to, C8161, CCRF-CEM, MOLT, mIMCD-3, NHDF, HeLa-S3, Huh1, Huh4, Huh7, HUVEC, HASMCC, HEKn, HEKa, MiaPaCell, Panc1, PC-3, TF1, CTLL-2, C1R, Rat R, CV R, RPTE, A R, T R, J R, A375, ARH-77, Calu R, SW480, SW620, OV R, SK-SKUT, CaCo R, P388D R, SEM-K R, WEHI-231, HB R, TIB R, Jurkat, J R, LRMB, Bcl-1, BcBC-3, IC R, SwD R, Raw264.7, NRK-NRK, COS-R, COS-72, COS-OCB R, mouse embryo-R, mouse embryo-3, mouse embryo-R, mouse embryo-3, mouse embryo; 10.1 mouse fibroblast, 293-T, 3T3, 721, 9L, A, A2780ADR, A2780cis, A172, A20, A253, A431, A-549, ALC, B16, BCP-1 cells, BEAS-2B, bEnd.3, BHK-21, BR 293, BxPC 16, C3 16-10T 16/2, C16/36, Cal-27, CHO-7, CHO-IR, CHO-K16, CHO-T, CHO Dhfr-/-, COR-L16/CPR, COR-L16/5010, COR-L16/R16, COS-7, COV-434, COL T16, HET 16, CORD 16, CAHB-145, EMHB-72, EMHB-L16, EMHB-16, HCHB-16, HCHB, Jurkat, JY cells, K562 cells, Ku812, KCL22, KG1, KYO1, LNCap, Ma-Mel 1-48, MC-38, MCF-7, MCF-10A, MDA-MB-231, MDA-MB-468, MDA-MB-435, MDCK II, MOR/0. R, MONO-MAC 6, MTD-1A, MyEnd, NCI-H69/CPR, NCI-H69/LX10, NCI-H69/LX20, NCI-H69/LX4, NIH-3T3, NALM-1, NW-145, OPCN/OPCT cell line, Peer, PNT-1A/PNT 2, RenCa, RIN-F, RMA/RMAS, OSS-2 cells, Sf-9, Skt-2, VCu-938, VeraP 638, VeraP-373, VCaP-7, MCU-7, MCD-6, MCI-H69/CPR, NCI-H69/LX10, NCI-H69/LX20, NCI-H, WM39, WT-49, X63, YAC-1, YAR and transgenic variants thereof. Cell lines can be obtained from a variety of sources known to those of skill in the art (see, e.g., the American Type Culture Collection (ATCC) (Manassus, Va)). In some embodiments, cells transfected with one or more vectors described herein are used to establish a new cell line that includes one or more vector-derived sequences. In some embodiments, a new cell line is established using cells transfected with components of a CRISPR system as described herein (e.g., by transient transfection with one or more vectors or transfection with RNA) and modified by the activity of the CRISPR complex, including cells that comprise water uptake but lack any other exogenous sequences. In some embodiments, cells transiently or non-transiently transfected with one or more of the vectors described herein, or cell lines derived from such cells, are used in evaluating one or more test compounds.
Aspects of the invention relate to an isogenic line of mammalian cells that produces genetic variations useful for studying diseases. An additional aspect of the invention relates to the generation of genetically modified animal models for transgenic or virus-mediated delivery. The invention also includes genomic modifications of microorganisms, cells, plants, animals or synthetic organisms for the production of products useful in biomedicine, agriculture and industry. In yet another aspect, the invention includes gene therapy. The invention can be used as a biological research tool for understanding genomes, such as gene knockout studies. The present invention relates to many other methods and compositions that rely on basic editing capabilities and the DNA components of rewritten genomes and targeted inactivation of DNA-based organisms. The invention may also be used as a treatment for targeting specific strains of bacterial infections, viral infections, and the like.
In some embodiments, one or more of the vectors described herein are used to produce a non-human transgenic animal or transgenic plant. In some embodiments, the transgenic animal is a mammal, such as a mouse, rat, or rabbit. In certain embodiments, the organism or subject is a plant. In certain embodiments, the organism or subject or plant is an algae. Methods for producing transgenic plants and animals are known in the art and generally begin with a method of cell transfection as described herein. Transgenic animals, as well as transgenic plants, particularly crops and algae, are also provided. The transgenic animals or plants can be used in applications other than providing disease models. These applications may include food or feed production by expressing, for example, higher levels of protein, carbohydrate, nutrient or vitamin than are typically seen in the wild type. In this connection, transgenic plants, in particular beans and tubers, and animals, in particular mammals, such as domestic animals (cows, sheep, goats and pigs), but also birds and food insects, are preferred.
Transgenic algae or other plants, such as oilseed rape, can be particularly useful in the production of plant oils or biofuels such as, for example, alcohols (particularly methanol and ethanol). These can be engineered to express or overexpress high levels of oils or alcohols for use in the oil or biofuel industry.
In one aspect, the invention provides methods of modifying a target polynucleotide in a eukaryotic cell, which methods can be in vivo, ex vivo, or in vitro. In some embodiments, the method comprises sampling a cell or population of cells from a human or non-human animal or plant (including microalgae), and modifying the cell or cells. The culturing may occur at any stage ex vivo. The cell or cells may even be reintroduced into the non-human animal or plant (including microalgae).
In one aspect, the invention provides methods for modifying a target polynucleotide in a eukaryotic cell. In some embodiments, the method comprises allowing a CRISPR complex to bind to the target polynucleotide to effect cleavage of said target polynucleotide, thereby modifying the target polynucleotide, wherein the CRISPR complex comprises a CRISPR enzyme complexed with a guide sequence that hybridizes to a target sequence within said target polynucleotide, wherein said guide sequence is linked to a tracr mate sequence that in turn hybridizes to a tracr sequence.
In one aspect, the invention provides methods of modifying the expression of a polynucleotide in a eukaryotic cell. In some embodiments, the method comprises allowing a CRISPR complex to bind to the polynucleotide such that said binding results in increased or decreased expression of said polynucleotide; wherein the CRISPR complex comprises a CRISPR enzyme complexed to a guide sequence that hybridizes to a target sequence within said polynucleotide, wherein said guide sequence is linked to a tracr mate sequence that in turn hybridizes to a tracr sequence.
With recent advances in crop genomics, the ability to use CRISPR-Cas systems for efficient and cost-effective gene editing and manipulation would allow rapid selection and comparison of single and multiplex genetic manipulations to transform such genomes in order to improve production and enhance traits. In this regard, reference is made to U.S. patents and publications: U.S. Pat. No. 6,603,061 Agrobacterium-Mediated Plant Transformation Method (Agrobacterium-Mediated Plant Transformation Method); U.S. Pat. No. 7,868,149-Plant genomic Sequences and uses thereof (Plant Genome Sequences and usesThereof) and US 2009/0100536-Transgenic genetic plants with Enhanced Agronomic Traits (Transgenic Plant design Enhanced Agronomic trails), the entire contents and disclosure of each of which are incorporated herein by reference in their entirety. In the practice of the present invention, Morrell (Morrell) et al, "crop genomics: progress and applications (Cropggenomics: advances and applications), "Nature review of genetics (Nat Rev Genet.) -2011, 12 months and 29 days; 13(2) 85-96 are also incorporated herein by reference in their entirety.
In plants, pathogens are often host-specific. For example, the Fusarium oxysporum tomato specialized type (Fusarium oxysporum f.sp.lycopersici) causes tomato blight and attacks only tomatoes, and the Fusarium graminearum wheat specialized type (f.oxysporum f.dianthii Puccinia graminis.sp.tritici) attacks only wheat. Plants have an existing and inducible defense against most pathogens. Mutations and recombination events across plant generations lead to genetic variability that creates sensitivity, particularly when pathogens multiply at a higher frequency than plants. Non-host resistance may be present in a plant, for example, the host and pathogen are incompatible. There may also be horizontal resistance, e.g., partial resistance against all species of pathogen, typically controlled by many genes, and vertical resistance, e.g., complete resistance against some but not others of the pathogen, typically controlled by few genes. At the gene-for-gene level, plants and pathogens evolve together, and genetic changes in one balance the changes in the other. Thus, using natural variation, breeders combine the most useful genes for yield, quality, uniformity, tolerance, resistance. Sources of resistance genes include natural or foreign Varieties, genealogical Varieties (Heirloom Varieties), closely related wild plants, and induced mutations, such as treatment of plant material with mutagens. By using the invention, a new mutation induction tool is provided for plant breeders. Thus, one skilled in the art can analyze the genome of the source of the resistance gene and employ the present invention to induce the development of the resistance gene in a variety having a desired characteristic or trait, which has better accuracy than previous mutagens and thus speeds up and improves plant breeding programs.
In one aspect, the invention provides kits comprising any one or more of the elements disclosed in the above methods and compositions. In some embodiments, the kit includes a carrier system and instructions for using the kit. In some embodiments, the carrier system comprises: (a) a first regulatory element operably linked to a tracr mate sequence and one or more insertion sites for insertion of a guide sequence upstream of the tracr mate sequence, wherein the guide sequence, when expressed, directs sequence-specific binding of a CRISPR complex to a target sequence in a eukaryotic cell, wherein the CRISPR complex comprises a CRISPR enzyme complexed to: (1) a guide sequence that hybridizes to the target sequence, and (2) a tracr mate sequence that hybridizes to the tracr sequence; and/or (b) a second regulatory element operably linked to an enzyme coding sequence encoding said CRISPR enzyme, said CRISPR enzyme comprising a nuclear localization sequence. The elements may be provided individually or in combination, and may be provided in any suitable container, such as a vial, bottle or tube. In some embodiments, the kit includes instructions in one or more languages, e.g., more than one language.
In some embodiments, a kit comprises one or more reagents for use in a method utilizing one or more of the elements described herein. The reagents may be provided in any suitable container. For example, the kit may provide one or more reaction or storage buffers. The reagents may be provided in a form which is useful in a particular assay or in a form which requires the addition of one or more other components prior to use (e.g. in concentrated or lyophilized form). The buffer may be any buffer including, but not limited to, sodium carbonate buffer, sodium bicarbonate buffer, borate buffer, Tris buffer, MOPS buffer, HEPES buffer, and combinations thereof. In some embodiments, the buffer is basic. In some embodiments, the buffer has a pH of from about 7 to about 10. In some embodiments, the kit comprises one or more oligonucleotides corresponding to a guide sequence for insertion into a vector, so as to operably link the guide sequence and a regulatory element. In some embodiments, the kit comprises one homologous recombination template polynucleotide.
In one aspect, the present invention provides methods for using one or more elements of a CRISPR system. The CRISPR complexes of the invention provide an effective means for modifying a target polynucleotide. The CRISPR complexes of the invention have a wide variety of utilities, including modification (e.g., deletion, insertion, translocation, inactivation, activation) of target polynucleotides in a variety of cell types. As such, the CRISPR complexes of the invention have a broad spectrum of applications in, for example, gene therapy, drug screening, disease diagnosis, and prognosis. Exemplary CRISPR complexes include CRISPR enzymes complexed with a guide sequence that hybridizes to a target sequence within a target polynucleotide. The guide sequence is linked to a tracr mate sequence which in turn hybridises to a tracr sequence.
The target polynucleotide of a CRISPR complex can be any polynucleotide endogenous or exogenous to a eukaryotic cell. For example, the target polynucleotide may be a polynucleotide that resides in the nucleus of a eukaryotic cell. The target polynucleotide may be a sequence encoding a gene product (e.g., a protein) or a non-coding sequence (e.g., a regulatory polynucleotide or non-useful DNA). Without wishing to be bound by theory, it is believed that the target sequence should be associated with PAM (protospacer adjacent motif); that is, associated with short sequences recognized by the CRISPR complex. The exact sequence and length requirements for a PAM vary depending on the CRISPR enzyme used, but a PAM is typically a 2-5 base pair sequence adjacent to the protospacer (that is, the target sequence). Examples of PAM sequences are given in the examples section below, and the skilled person will be able to identify additional PAM sequences for use with a given CRISPR enzyme.
Target polynucleotides of CRISPR complexes can include a plurality of disease-associated genes AND polynucleotides as well as signaling biochemical pathway phase genes AND polynucleotides, as listed in U.S. provisional patent applications 61/736,527 AND 61/748,427, filed 12/2012 AND 2/2013, respectively, entitled SYSTEMS METHODS AND COMPOSITIONS FOR sequence manipulation (SYSTEMS METHODS AND COMPOSITIONS FOR sequence use), having the bordered reference numbers BI-2011/008/WSGR case numbers 44063-701.101 AND BI-2011/008/wsty case gr case numbers 44063-701.102, respectively, the contents of all of which are incorporated herein by reference in their entirety.
Examples of target polynucleotides include sequences associated with signaling biochemical pathways, such as signaling biochemical pathway-associated genes or polynucleotides. Examples of target polynucleotides include disease-associated genes or polynucleotides. A "disease-associated" gene or polynucleotide refers to any gene or polynucleotide that produces a transcription or translation product at an abnormal level or in an abnormal form in cells derived from a disease-affected tissue, as compared to a non-disease control tissue or cell. Where altered expression is associated with the appearance and/or progression of a disease, it may be a gene that is expressed at an abnormally high level; it may be a gene that is expressed at an abnormally low level. A disease-associated gene also refers to a gene having one or more mutations or genetic variation that is directly responsible for or in linkage disequilibrium with one or more genes responsible for the etiology of a disease. The transcribed or translated product may be known or unknown, and may be at normal or abnormal levels.
Examples of disease-associated genes and polynucleotides are available from McKucock-Nathans Institute of Genetic Medicine, Johns Hopkins university (McKumock-Nathans Institute of Genetic Medicine, Johns Hopkins university) (Baltimore, Maryland) and the National center for Biotechnology Information, National Library of Medicine (Besserda, Maryland).
Examples of disease-associated genes and polynucleotides are listed in tables a and B. Disease-specific information available on the world Wide Web is available from the McKucock-Narsen institute of Genetic Medicine, Johns Hopkins University (McKumock-Nathans institute of Genetic Medicine, Johns Hopkins University) (Bourman, Maryland) and the National Center for Biotechnology information of the National Library of Medicine (National Center for Biotechnology information, National Library of Medicine) (Besserda, Maryland). Examples of signaling biochemical pathway-associated genes and polynucleotides are listed in table C.
Mutations in these genes and pathways can result in the production of inappropriate proteins or proteins that affect function in inappropriate amounts. Additional examples of genes, diseases, and proteins from U.S. provisional application 61/736,527 filed 12/2012 and 61/748,427 filed 1/2/2013 are hereby incorporated by reference. Such genes, proteins and pathways may be target polynucleotides for CRISPR complexes.
TABLE A
Figure BDA0002377677250000511
Figure BDA0002377677250000521
Figure BDA0002377677250000531
Table B:
Figure BDA0002377677250000532
Figure BDA0002377677250000541
Figure BDA0002377677250000551
Figure BDA0002377677250000561
Figure BDA0002377677250000571
Figure BDA0002377677250000581
Figure BDA0002377677250000591
table C:
Figure BDA0002377677250000592
Figure BDA0002377677250000601
Figure BDA0002377677250000611
Figure BDA0002377677250000621
Figure BDA0002377677250000631
Figure BDA0002377677250000641
Figure BDA0002377677250000651
Figure BDA0002377677250000661
Figure BDA0002377677250000671
Figure BDA0002377677250000681
Figure BDA0002377677250000691
Figure BDA0002377677250000701
Figure BDA0002377677250000711
Figure BDA0002377677250000721
Figure BDA0002377677250000731
Figure BDA0002377677250000741
Figure BDA0002377677250000751
Figure BDA0002377677250000761
Figure BDA0002377677250000771
Figure BDA0002377677250000781
Figure BDA0002377677250000791
embodiments of the invention also relate to methods and compositions related to knocking out genes, amplifying genes, and repairing specific mutations associated with DNA repeat instability and neurological disorders (Robert d. wells), reed swamp philosophy (Tetsuo Ashizawa), Genetic instability and neurological Diseases (Genetic acquired and neurological Diseases), second edition, Academic Press, 2011 10/13/Medical (Medical)). Specific aspects of tandem repeats have been found to be responsible for more than twenty human diseases (New instability of repetition: role of RNA, DNA hybrids), McIvor EI (El), Polak U (Polak U), Naperla M (Napieralm), RNA biology (RNA Biol.) 9-10 months 2010; 7(5): 551-8). The CRISPR-Cas system can be used to correct defects in genomic instability.
An additional aspect of the invention relates to the use of the CRISPR-Cas system to correct for the defects of EMP2A and EMP2B genes that have been identified as being associated with lafura disease. Lafordia is an autosomal recessive disorder characterized by progressive myoclonic epilepsy that can begin as seizures in the juvenile phase. A few of the diseases can be caused by mutations in genes that have not yet been identified. The disease causes seizures, muscle spasms, difficulty walking, dementia, and ultimately death. No therapy is currently proven effective against disease progression. Other Genetic abnormalities associated with Epilepsy may also target the CRISPR-Cas system and basic Genetics are further described in "Epilepsy and hereditary Epilepsy Genetics" (Genetics of Epilepsy and Genetic epistasis), marini pediatric neurological Foundation (Mariani Foundation neurological), edited by julia naevi (gilliao avanzini), jeffey l. 20; 2009) in (1).
In yet another aspect of the invention, the CRISPR-Cas system can be used to correct several Genetic mutations causing ocular defects, which is further described in Genetic Diseases of the Eye (Genetic Diseases of the Eye), second edition, edited by leiasia (Elias) i.
Several additional aspects of the invention relate to correcting the deficiencies associated with a wide range of Genetic diseases that are further described at the national institutes of health website under the topic of subsection hereditary Disorders (Genetic Disorders). Hereditary encephalopathies can include, but are not limited to, adrenoleukodystrophy, corpus callosum dysplasia, aicardia Syndrome (Aicardi Syndrome), Alpers ' Disease, alzheimer's Disease, Barth Syndrome, bartenia (Battendisease), cadail, cerebellar degeneration, fibrari's Disease, Gerstmann-Straussler-Scheinker Disease, huntington's Disease, and other triplet repeat disorders, Leigh's Disease, lesch-nyun Syndrome, menkes Disease, mitochondrial myopathy, and NINDS cavern brain (colloceponly). These diseases are further described at the national institutes of health website under the nodulation hereditary Brain Disorders (Genetic Brain Disorders).
In some embodiments, the disorder can be neoplasia. In some embodiments, where the disorder is neoplasia, the gene to be targeted is any one of those listed in table a (in this case PTEN, etc.). In some embodiments, the disorder can be age-related macular degeneration. In some embodiments, the condition may be a schizophrenia disorder. In some embodiments, the disorder can be a trinucleotide repeat disorder. In some embodiments, the disorder may be fragile X syndrome. In some embodiments, the condition can be a secretase-related disorder. In some embodiments, the condition can be a prion-related disorder. In some embodiments, the disorder may be ALS. In some embodiments, the disorder can be a drug addiction. In some embodiments, the disorder can be autism. In some embodiments, the disorder can be alzheimer's disease. In some embodiments, the disorder can be inflammation. In some embodiments, the disorder can be parkinson's disease.
Examples of proteins associated with Parkinson's disease include, but are not limited to, α -synuclein, DJ-1, LRRK2, PINK1, parkin, UCHL1, Synphilin-1, and NURR 1.
Examples of addiction related proteins may include, for example, ABAT.
Examples of inflammation-associated proteins may include, for example, monocyte chemoattractant protein-1 (MCP1) encoded by the Ccr2 gene, C-C chemokine receptor type 5(Ccr5) encoded by the Ccr5 gene, IgG receptor IIB (Fcgr2b, also known as CD32) encoded by the Fcgr2b gene, or Fcer1g (Fcer1g) encoded by the Fcer1g gene.
Examples of cardiovascular disease-related proteins may include, for example, IL1B (interleukin 1, β), XDH (xanthine dehydrogenase), TP53 (oncoprotein p53), PTGIS (prostaglandin I2 (prostacyclin) synthase), MB (myoglobin), IL4 (interleukin 4), ANGPT1 (angiopoietin 1), ABCG8 (ATP-binding cassette, subfamily g (white), member 8) or CTSK (cathepsin K).
Examples of alzheimer's disease-related proteins may include, for example, very low density lipoprotein receptor protein (VLDLR) encoded by the VLDLR gene, ubiquitin-like modifier activator 1(UBA1) encoded by the UBA1 gene, or NEDD 8-activator E1 catalytic subunit protein (UBE1C) encoded by the UBA3 gene.
Examples of autism spectrum disorder-associated proteins may include, for example, benzodiazepine receptor (peripheral) associated protein 1(BZRAP1) encoded by BZRAP1 gene, AF4/FMR2 family member 2 protein (AFF2) (also known as MFR2) encoded by AFF2 gene, fragile X mental retardation autosomal homolog 1 protein (FXR1) encoded by FXR1 gene, or fragile X mental retardation autosomal homolog 2 protein (FXR2) encoded by FXR2 gene.
Examples of macular degeneration-related proteins may include, for example, the ATP-binding cassette encoded by the ABCR gene, the subfamily a (ABC1) member 4 protein (ABCA4), the apolipoprotein E protein encoded by the APOE gene (APOE), or the chemokine (C-C motif) ligand 2 protein encoded by the CCL2 gene (CCL 2).
Examples of schizophrenia-related proteins may include NRG1, ErbB4, CPLX1, TPH1, TPH2, NRXN1, GSK3A, BDNF, DISC1, GSK3B, and combinations thereof.
Examples of proteins involved in tumor inhibition may include, for example, ATM (ataxia telangiectasia mutated), ATR (ataxia telangiectasia and Rad3 associated), EGFR (epidermal growth factor receptor), ERBB2(v-erb-b2 erythroleukemia virus oncogene homolog 2), ERBB3(v-erb-b2 erythroleukemia virus oncogene homolog 3), ERBB4(v-erb-b2 erythroleukemia virus oncogene homolog 4), Notch 1, Notch 2, Notch 3, or Notch 4.
Examples of proteins associated with secretase disorders may include, for example, PSENEN (presenilin enhancer 2 homolog (caenorhabditis elegans)), CTSB (cathepsin B), PSEN1 (presenilin 1), APP (amyloid β (a4) precursor protein), APH1B (prepharyngeal defect 1 homolog B (caenorhabditis elegans)), PSEN2 (presenilin 2 (alzheimer's disease 4)), or BACE1(β -site APP-cleaving enzyme 1).
Examples of proteins associated with amyotrophic lateral sclerosis may include SOD1 (superoxide dismutase 1), ALS2 (amyotrophic lateral sclerosis 2), FUS (fused in sarcoma), TARDBP (TAR DNA binding protein), VAGFA (vascular endothelial growth factor a), VAGFB (vascular endothelial growth factor B), and VAGFC (vascular endothelial growth factor C), and any combination thereof.
Examples of proteins associated with prion diseases may include SOD1 (superoxide dismutase 1), ALS2 (amyotrophic lateral sclerosis 2), FUS (fused in sarcoma), TARDBP (TAR DNA binding protein), VAGFA (vascular endothelial growth factor a), VAGFB (vascular endothelial growth factor B), and VAGFC (vascular endothelial growth factor C), and any combination thereof.
Examples of proteins associated with neurodegenerative diseases in prion disorders can include, for example, A2M (α -2-macroglobulin), AATF (apoptosis antagonistic transcription factor), ACPP (acid phosphatase of the prostate), ACTA2 (actin α 2 smooth muscle aorta), ADAM22(ADAM metallopeptidase domain), ADORA3 (adenosine a3 receptor), or ADRA1D (α -1D adrenergic receptor (Alpha-1D adrenergic receptor or Alpha-1D adrenergic receptor)).
Examples of proteins associated with immunodeficiency may include, for example, A2M [ α -2-macroglobulin ], AANAT [ arylalkylamine N-acetyltransferase ],. ABCA1[ ATP-binding cassette, subfamily A (ABC1), member 1],. ABCA2[ ATP-binding cassette, subfamily A (ABC1), member 2], or ABCA3[ ATP-binding cassette, subfamily A (ABC1), member 3 ].
Examples of proteins associated with trinucleotide repeat disorders include, for example, AR (androgen receptor), FMR1 (fragile X mental retardation 1), HTT (huntingtin) or DMPK (myotonic dystrophy protein kinase), FXN (frataxin), ATXN2 (ataxin 2).
Examples of proteins associated with neurotransmission disorders include, for example, SST (somatostatin), NOS1 (nitric oxide synthase 1 (neuronal)), ADRA2A (adrenergic, α -2A-, receptor), ADRA2C (adrenergic, α -2C-, receptor), TACR1 (tachykinin receptor 1) or HTR2C (5-hydroxytryptamine (serotonin) receptor 2C).
Examples of neurodevelopmentally associated sequences include, for example, A2BP1[ ataxin 2-binding protein 1], AADAT [ aminoadipate aminotransferase ], AANAT [ arylalkylamine N-acetyltransferase ], ABAT [ 4-aminobutyrate aminotransferase ], ABCA1[ ATP-binding cassette, subfamily A (ABC1), member 1] or ABCA13[ ATP-binding cassette, subfamily A (ABC1), member 13 ].
Further examples of preferred disorders which can be treated with the system of the invention may be selected from Aicardi-Guotrey Syndrome (Aicardi-Gouti res Syndrome), Alexander disease, Allen-Helen-Dadrey Syndrome (Allan-Herndon-Dudley Syndrome), POLG-related disorders, α -mannosidosis (types II and III), Alsterron Syndrome (Athler Syndrome)
Figure BDA0002377677250000831
Syndrome, Angerman, Syndrome, ataxia-telangiectasia, neuronal ceroid-lipofuscin deposition, β -thalassemia, bilateral optic atrophy and optic atrophy of type 1 (in infants), retinoblastoma (bilateral), Canavan's Disease (Canavan Disease), brain-eye-face-bone Syndrome (Cerebrosulofacikeletal Syndrome)1[ COFS1](ii) a Brain tendon xanthomatosis; synephrine dirachy syndrome (Cornelia de langesdrome); a MAPT-related disorder; hereditary prion diseases; delaviru Syndrome (Dravet Syndrome); early onset familial alzheimer's disease; friedreich's ataxia [ FRDA ]](ii) a Multiple malformations; fucoside storage disorders; foshan (Fukuyama) congenital muscular dystrophy; galactosialic acid storage disorder; gaucher Disease (Gaucher Disease); organic acidemia; lymphohistiocytosis with hemophagic cells; premature senility syndrome; mucolipidosis II; free sialic acid storage disease in infants; PLA2G 6-associated neurodegeneration; yewe and Lange-Nielsen syndrome (Jervell and Lange-Nielsen Syndrome); combined epidermolysis bullosa; huntington's disease; krabbe Disease (infantile); mitochondrial DNA-Associated Leigh Syndrome (Mitochondrial DNA-Associated Leigh Syndrome) and NARP; lesch-nyen syndrome; LIS1 related to no gyria; rockwell Syndrome (Lowe Syndrome); maple syrup urine disease; MECP2 replication syndrome; ATP 7A-associated copper transport disorders; LAMA 2-associated muscular dystrophy; arylsulfatase a deficiency; I. mucopolysaccharide type II or III storage; peroxisome biogenesis disorder, ziwei lineage syndrome (Zellweger Syndr)ome Spectrum); neurodegeneration associated with brain iron accumulation disorders; acid sphingomyelinase deficiency; niemann-pick disease type C; glycine encephalopathy; an ARX-related disorder; urea cycle disorders; COL1A1/2 related osteogenesis imperfecta; mitochondrial DNA deletion syndrome; PLP1 related disorders; perry Syndrome (Perry Syndrome); Feren-McDermid Syndrome (Phelan-McDermid Syndrome); type II glycogen storage Disease (Pompe Disease) (of infants); a MAPT-related disorder; MECP 2-related disorders; type 1 limb proximal punctate achondroplasia (Rhizomelic Chondrodysplasia Punctata Type 1); roberts Syndrome (Roberts Syndrome); sandhoff Disease (Sandhoff Disease); sindler Disease (Schinder Disease) -type 1; adenosine deaminase deficiency; schroen-aussler syndrome; spinal muscular atrophy; infant onset spinocerebellar ataxia; hexosaminidase a deficiency; lethal dysplasia type 1; collagen type VI-related disorder; -type I uker syndrome (UsherSyndrome); congenital muscular dystrophy; wolff-herch hoden Syndrome (Wolf-Hirschhorn Syndrome); lysosomal acid lipase deficiency; and xeroderma pigmentosum.
As will be apparent, it is contemplated that any polynucleotide sequence of interest may be targeted using the present system. Some examples of conditions or diseases for which treatment using the system of the invention may be useful are included in the table above and examples of genes currently associated with those conditions are also provided herein. However, the exemplified genes are not exhaustive.
Examples of the invention
The following examples are given for the purpose of illustrating different embodiments of the invention and are not intended to limit the invention in any way. The present examples, together with the methods described herein, presently represent preferred embodiments, are exemplary and are not intended to limit the scope of the invention. Variations and other uses herein will occur to those skilled in the art which are encompassed within the spirit of the invention as defined by the scope of the claims.
Example 1: CRISPR complex activity in the nucleus of eukaryotic cells
One exemplary type II CRISPR system is a type II CRISPR locus from streptococcus pyogenes SF370 comprising a cluster of four genes Cas9, Cas1, Cas2 and Csn1 and a characteristic array of two non-coding RNA elements tracrRNA and repeats (direct repeats) spaced by short stretches of non-repeats (spacers, each of about 30 bp). In this system, targeted DNA Double Strand Breaks (DSBs) are generated in four sequential steps (fig. 2A). In the first step, two non-coding RNA pre-crRNA arrays and tracrRNA are transcribed from the CRISPR locus. In the second step, tracrRNA is hybridized to the direct repeats of the pre-crRNA, which is then processed into mature crRNA containing a separate spacer sequence. tracrRNA complex directs Cas9 to a DNA target consisting of a protospacer and a corresponding PAM via formation of a heteroduplex between the spacer region of the crRNA and the protospacer DNA. Finally, Cas9 mediates cleavage of the target DNA upstream of the PAM to generate one DSB within the protospacer (fig. 2A). This example describes an exemplary process for adapting this RNA programmable nuclease system to direct CRISPR complex activity in the nucleus of a eukaryotic cell.
Cell culture and transfection
At 37 ℃ with 5% CO2Human Embryonic Kidney (HEK) cell line HEK293FT (Life technologies) was maintained in Dulbecco's Modified Eagle's Medium (DMEM) supplemented with 10% fetal bovine serum (HyClone), 2mM GlutaMAX (Life technologies), 100U/mL penicillin and 100. mu.g/mL streptomycin. At 37 ℃ in 5% CO2Next, a mouse neuro2A (N2A) cell line (ATCC) was maintained in DMEM supplemented with 5% fetal bovine serum (Haycolon), 2mMGlutama (Life technologies), 100U/mL penicillin, and 100. mu.g/mL streptomycin.
One day prior to transfection, HEK293FT or N2A cells were seeded into 24-well plates (Corning) at a density of 200,000 cells/well. Following the manufacturer's recommended protocol, cells were transfected using Lipofectamine 2000 (Life technologies). For each well of a 24-well plate, a total of 800ng of plasmid was used.
Surveyor assay and sequencing analysis of genome modifications
HEK293FT or N2A cells were transfected with plasmid DNA as described above. After transfection, cells were incubated at 37 ℃ for 72 hours prior to genomic DNA extraction. Genomic DNA was extracted using the Quickextract DNA extraction kit (Epicentre) following the manufacturer's protocol. Briefly, cells were resuspended in QuickExtract solution and incubated at 65 ℃ for 15 minutes and 98 ℃ for 10 minutes. The extracted genomic DNA was immediately processed or stored at-20 ℃.
For each gene, the genomic region surrounding the CRISPR target site was PCR amplified and the product was purified using QiaQuick Spin columns (Qiagen) following the manufacturer's protocol. A total of 400ng of purified PCR product was mixed with 2 μ l 10X Taq polymerase PCR buffer (enzymes) and ultrapure water to a final volume of 20 μ l and subjected to a reannealing process so that heteroduplexes could be formed: 95 ℃ for 10min, at-2 ℃/s 95 ℃ to 85 ℃, at-0.25 ℃/s 85 ℃ to 25 ℃, and at 25 ℃ for 1 min. After re-annealing, the products were treated with surfyor nuclease and surfyor enhancer S (transgenics) following the manufacturer' S recommended protocol and analyzed on 4% -20% Novex TBE polyacrylamide gels (life technologies). The gels were stained with SYBRGold DNA stain (life technologies) for 30 minutes and imaged with Gel Doc Gel imaging system (Bio-rad). Quantification is based on relative band intensities as a measure of the fraction of cleaved DNA. A schematic of this Surveyor assay is provided in fig. 7.
Restriction fragment length polymorphism assay for the detection of homologous recombination.
HEK293FT and N2A cells were transfected with plasmid DNA and incubated at 37 ℃ for 72 hours prior to genomic DNA extraction as described above. The target genomic region was PCR amplified using primers outside the homology arms of the Homologous Recombination (HR) template. The PCR product was separated on a 1% agarose gel and extracted with MinElute GelExtraction kit (Qiagen). The purified product was digested with HindIII (Fermentas) and analyzed on a 6% Novex TBE polyacrylamide gel (Life technologies).
RNA secondary structure prediction and analysis
RNA secondary structure prediction using a centroid structure prediction algorithm using an online web server RNAfold developed by Institute for Theoretical Chemistry, Vienna (University of Vienna) (see, e.g., a.r. gruber (a.r. gruber) et al, 2008, cells (Cell)106(1): 23-24; and PA Carr and GM Church, 2009, nature biotechnology (nature biotechnology)27(12): 1151-62).
RNA purification
HEK293FT cells were maintained and transfected as described above. Cells were harvested by trypsinization, followed by washing in Phosphate Buffered Saline (PBS). Following the manufacturer's protocol, total cellular RNA was extracted using TRI reagent (sigma). Extracted total RNA was quantified and normalized to the same concentration using naonodorop (Thermo Scientific).
Northern blot analysis of crRNA and tracrRNA expression in mammalian cells
RNA was mixed with an equal volume of 2X loading buffer (Ambion), heated to 95 ℃ for 5min, frozen on ice for 1min, and then loaded onto 8% denaturing polyacrylamide gel (SequaGel, National Diagnostics) after running the gel pre-gel for at least 30 min. The samples were electrophoresed at the 40W limit for 1.5 hours. Thereafter, the RNA was transferred to a 300mA Hybond N + membrane (GE Healthcare) in a semi-dry transfer apparatus (Bio-rad) at room temperature for 1.5 hours. RNA was crosslinked to the membrane using an auto-crosslinking button on Stratagene UV Crossslinker the Stratalinker (Stratagene). The membrane was prehybridized in ULTRAhyb-Oligo hybridization buffer (Ambion) for 30min at 42 ℃ with rotation, and then the probe was added and hybridized overnight. Probes were ordered from IDTs and used with [ gamma-32P]ATP (Perkin Elmer) label. The membrane was washed once with pre-warmed (42 ℃)2XSSC, 0.5% SDS for 1min, followed by two washes at 42 ℃ for 30 min. The film is coated with a coatingThe phosphor screen was exposed to light at room temperature for one hour or overnight and then scanned with a photoimager (Typhoon).
Bacterial CRISPR system construction and evaluation
CRISPR locus elements (including tracrRNA, Cas9, and leader) were PCR amplified from streptococcus pyogenes SF370 genomic DNA with flanking homology arms for Gibson splicing (Gibson Assembly). Two BsaI type IIS sites were introduced between the two direct repeats to facilitate convenient insertion of the spacer (FIG. 8). The PCR product was cloned into EcoRV-digested pACYC184, downstream of the tet promoter, using a Gibson AssemblyMaster Mix (NEB). Other endogenous CRISPR system elements were omitted, except for the last 50bp of Csn 2. Oligos encoding spacers with complementary overhangs (Integrated DNA Technology) were cloned into BsaI-digested vector pDC000(NEB) and then ligated with T7 ligase (Enzymatics) to generate pCRISPR plasmid. A priming plasmid comprising a spacer with PAM expression in mammalian cells (expression construct shown in figure 6A, where functionality is determined as the result of the Surveyor assay shown in figure 6B). The transcription initiation site is marked as +1 and also the transcription terminator and the sequence probed by Northern blot are indicated. The expression of the processed tracrRNA was also confirmed by Northern blotting. FIG. 6C shows the results of Northern blot analysis of total RNA extracted from 293FT cells transfected with U6 expression constructs carrying long or short tracrRNA and SpCas9 and DR-EMX1(1) -DR. The left and right panels are from 293FT cells transfected with or without SpRNAse III, respectively. U6 indicates loading controls blotted with a probe targeting human U6 snRNA. Transfection of the short tracrRNA expression constructs produced abundant levels of processed forms of tracrRNA (-75 bp). Very low amounts of long tracrRNA were detected on Northern blots.
To facilitate accurate initiation of transcription, the U6 promoter based on RNA polymerase III was chosen to drive expression of tracrRNA (fig. 2C). Similarly, constructs based on the U6 promoter were developed to express pre-crRNA arrays consisting of a single spacer flanked by two direct repeats (DR, also encompassed by the term "tracr mate sequence"; FIG. 2C). The initiation spacer was designed to target a 33-base pair (bp) target site (30-bp protospacer plus 3-bp CRISPR motif (PAM) sequence that satisfies the NGG recognition motif of Cas9) in the human EMX1 locus (fig. 2C), a key gene in the development of the cerebral cortex.
To test whether heterologous expression of the CRISPR system (SpCas9, sprnase III, tracrRNA, and pre-crRNA) in mammalian cells could achieve targeted cleavage of mammalian chromosomes, HEK293FT cells were transfected with a combination of CRISPR components. Since DSBs in mammalian cell nuclei are partially repaired by non-homologous end joining (NHEJ) pathways leading to indels formation, the potential cleavage activity at the target EMX1 locus was detected using the Surveyor assay (fig. 7) (see e.g. Guschin et al 2010, Methods of molecular biology 649: 247). Co-transfection of all four CRISPR components was able to induce up to 5.0% cleavage in the prototype spacer (see figure 2D). Cotransfection of all CRISPR components (minus sprnase III) also induced up to 4.7% indels in the protospacer, indicating that there may be endogenous mammalian rnases capable of assisting crRNA maturation, such as e.g. related Dicer and Drosha enzymes. Removal of any of the remaining three components abolished the genome cleavage activity of the CRISPR system (fig. 2D). Sanger sequencing of amplicons comprising the target locus for which cleavage activity was demonstrated: of the 43 sequenced clones, 5 mutant alleles (11.6%) were found. Similar experiments using various guide sequences yielded indel percentages as high as 29% (see FIGS. 3-6, 10 and 11). These results define a three-component system for efficient CRISPR-mediated genome modification in mammalian cells. To optimize the cleavage efficiency, applicants also tested whether different isoforms of tracrRNA affect the cleavage efficiency and found that, in the example system, only a short (89-bp) transcript form could mediate cleavage of the human EMX1 genomic locus (fig. 6B).
FIG. 12 provides additional Northern blot analysis of crRNA processing in mammalian cells. FIG. 12A shows a schematic diagram showing an expression vector flanked by two single spacers of direct repeats (DR-EMX1(1) -DR). The 30bp spacer and direct repeat sequence targeting the human EMX1 locus protospacer 1 (see figure 6) is shown in the sequence below figure 12A. The straight line indicates the region whose reverse complement was used to generate the Northern blot probe for the detection of EMX1(1) crRNA. FIG. 12B shows Northern blot analysis of total RNA extracted from 293FT cells transfected with the U6 expression construct carrying DR-EMX1(1) -DR. The left and right panels are from 293FT cells transfected with or without SpRNAse III, respectively. DR-EMX1(1) -DR was processed to mature crRNA only in the presence of SpCas9 and short tracrRNA and was independent of the presence of sprnase III. The mature crRNA detected from transfected 293FT total RNA was approximately 33bp and shorter than the 39-42bp mature crRNA from S.pyogenes. These results demonstrate that CRISPR systems can be transplanted into eukaryotic cells and reprogrammed to facilitate cleavage of endogenous mammalian target polynucleotides.
Fig. 2 shows the bacterial CRISPR system described in this example. Figure 2A shows a schematic diagram showing CRISPR loci from streptococcus pyogenes SF370 and the proposed mechanism of CRISPR-mediated DNA cleavage by this system. Mature crRNA-guided Cas9 processed from direct repeat-spacer arrays to genomic targets consisting of complementary protospacer and protospacer-adjacent motif (PAM). Upon target-spacer base pairing, Cas9 mediates double strand breaks in the target DNA. Fig. 2B shows the engineering of streptococcus pyogenes Cas9(SpCas9) and rnase III (sprnase III) with Nuclear Localization Signals (NLS) that enable introduction into mammalian cell nuclei. Fig. 2C shows mammalian expression of SpCas9 and sprnase III driven by the constitutive EF1a promoter, and tracrRNA and pre-crRNA arrays (DR-spacer-DR) driven by the RNA Pol3 promoter, U6, which promotes precise initiation and termination of transcription. A prototype spacer from the human EMX1 locus with a satisfactory PAM sequence was used as the spacer in the pre-crRNA array. Figure 2D shows SpCas 9-mediated Surveyor nuclease assay for minor insertions and deletions. SpCas9 was expressed with and without sprnase III, tracrRNA, and a pre-crRNA array carrying an EMX 1-target spacer. Figure 2E shows a schematic representation of base pairing between the target locus and EMX 1-targeting crRNA and an exemplary chromatogram showing a minor deletion adjacent to the SpCas9 cleavage site. Figure 2F shows mutant alleles identified from sequencing analysis of 43 clonal amplicons that display multiple minor insertions and deletions. Dashes indicate missing bases, and non-aligned or mismatched bases indicate insertions or mutations. Scale bar 10 μm.
To further simplify this three component system, a chimeric crRNA-tracrRNA hybrid design is adapted in which the mature crRNA (including a guide sequence) can be fused via a stem-loop to a portion of the tracrRNA to mimic the natural crRNA: tracrRNA duplex in order to increase the efficiency of co-delivery, a bicistronic expression vector is generated to drive co-expression of the chimeric RNA and SpCas9 in transfected cells in parallel, the bicistronic vector is used to express pre-crRNA (DR-guide-DR) and SpCas9 to induce processing of the crRNA with the separately expressed tracrRNA (compare top and bottom panels of fig. 11B), fig. 8 provides a schematic of a pre-crRNA array (fig. 8A) or chimeric crRNA (represented by a short line downstream of the guide sequence insertion site in fig. 8B and upstream of the gamete of the guide sequence 1 α promoter) to the bicistronic expression vector of hbsag hspcrrna 9, shows the location of the various elements and the position of the guide sequence in the guide sequence (indicated by the insertion of SEQ ID: the dna sequence coding sequence of SEQ ID: the chimeric RNA polymerase, the chimeric RNA design of the chimeric RNA, the chimeric RNA sequence promoter, the chimeric RNA sequence shown in fig. 8B, the map 2, the promoter, shows the cleavage efficiency of the chimeric RNA sequence, the promoter, the chimeric RNA sequence, the promoter, the chimeric RNA sequence, the promoter, was determined by cleavage efficiency of SEQ ID, was determined by cleavage of SEQ ID, and the promoter, was determined by the.
By designing chimeric RNAs that target multiple sites in human EMX1 and PVALB and mouse Th loci, the prevalence of CRISPR-mediated cleavage in eukaryotic cells was tested by targeting additional genomic loci in both human and mouse cells. Figure 13 shows screening of some additional targeting protospacer in human PVALB (figure 13A) and mouse Th (figure 13B) loci. Schematic representations of the locus positions within the respective last exons and the positions of the three prototypical spacers are provided. The underlined sequences included a 30bp protospacer sequence and 3bp corresponding to the 3' end of the PAM sequence. The protospacer on the sense and antisense strands is indicated above and below the DNA sequence, respectively. Human PVALB and mouse Th loci achieved modification rates of 6.3% and 0.75%, respectively, demonstrating the broad applicability of the CRISPR system in modifying different loci across multiple organisms (figure 5). Although cleavage was detected with only one third of the spacer for each locus using the chimeric construct, all target sequences were cleaved with up to 27% efficient indel production when using the co-expressed pre-crRNA arrangement (fig. 6 and 13).
Fig. 11 provides an additional illustration of SpCas9 that can be reprogrammed to target multiple genomic loci in mammalian cells. Figure 11A provides a schematic of the human EMX1 locus showing the positions of the five prototypical spacers, indicated by the underlined sequence. FIG. 11B provides a schematic of the pre-crRNA/trcrRNA complex showing the hybridization between the direct repeats of the pre-crRNA and the tracrRNA (top), and a schematic of the chimeric RNA design, including a20 bp guide sequence and a tracr mate-pair consisting of partial direct repeats and a tracr sequence and a tracrRNA sequence that hybridizes in a hairpin structure (bottom). The results of the Surveyor assay comparing the efficiency of Cas9 mediated cleavage at the five proto-type spacers in the human EMX1 locus are shown in figure 11C. Each protospacer was targeted using a processed pre-crRNA/tracrRNA complex (crRNA) or chimeric rna (chirna).
Since the secondary structure of RNA can be crucial for intermolecular interactions, the putative secondary structures of all guide sequences used in genome targeting experiments were compared using a structure prediction algorithm based on the minimum free energy and Boltzmann (Boltzmann) weighted structure set (see, e.g., grubecl (Gruber) et al, 2008, nucleic acids Research, 36: W70). Analysis revealed that in most cases, the effective guide sequence in the context of chimeric crRNA was essentially free of secondary structural motifs, while the ineffective guide sequence was more likely to form internal secondary structures that could prevent base pairing with the target protospacer DNA. Thus, it is likely that when chimeric crrnas are used, the variability of the spacer secondary structure may affect the efficiency of CRISPR-mediated interference.
Additional vector designs for SpCas9 are shown in fig. 22, showing a single expression vector incorporating the U6 promoter linked to the insertion site of the guide oligonucleotide and the Cbh promoter linked to the SpCas9 coding sequence. The vector shown in figure 22b comprises a tracrRNA coding sequence linked to the H1 promoter.
In bacterial assays, all spacers promote efficient CRISPR interference (fig. 3C). These results indicate that there may be additional factors that influence the efficiency of CRISPR activity in mammalian cells.
To investigate the specificity of CRISPR-mediated cleavage, a series of EMX 1-targeted chimeric crrnas with single point mutations were used to analyze the effect of single nucleotide mutations in the guide sequence on prototypical spacer cleavage in the mammalian genome (fig. 3A). Figure 3B shows the results of surfyor nuclease assay comparing the cleavage efficiency of Cas9 when paired with chimeric RNAs of different mutations. A single base mismatch of up to 12-bp 5' of PAM substantially eliminated genomic cleavage by SpCas9, while spacers with mutations further away from the upstream position retained activity against the original protospacer target (fig. 3B). In addition to PAM, SpCas9 has single base specificity within the last 12-bp of the spacer. In addition, CRISPR is able to mediate genome cleavage as efficiently as a pair of TALE nucleases (TALENs) targeting the same EMX1 protospacer. Figure 3C provides a schematic showing the design of TALENs targeting EMX1 and figure 3D shows a Surveyor gel (n-3) comparing the efficiency of TALENs and Cas 9.
A set of components for achieving CRISPR-mediated gene editing in mammalian cells has been established by the error-prone NHEJ mechanism, testing the ability of CRISPR to stimulate Homologous Recombination (HR), a high fidelity gene repair pathway for making edits in the genome precise. Wild-type SpCas9 is able to mediate site-specific DSBs that can be repaired by both NHEJ and HR. In addition, aspartate to alanine substitutions (D10A) in the RuvC I catalytic domain of SpCas9 were engineered to convert nucleases to nickases (SpCas9 n; shown in FIG. 4A) (see, e.g., Sapranausaks et al, 2011, Nucleic Acids Research (Nucleic Acids Research), 39: 9275; Gasonas et al, 2012, Proc. Natl. Acad. Sci. USA, 109: E2579) such that the nicked genomic DNA undergoes high fidelity directed repair (HDR). The Surveyor assay confirmed that SpCas9n produced no indels at the EMX1 prototype spacer target. As shown in fig. 4B, co-expression of EMX 1-targeted chimeric crRNA with SpCas9 produced indels in the target site, whereas co-expression with SpCas9n did not produce indels (n ═ 3). Furthermore, sequencing of 327 amplicons did not detect any indels induced by SpCas9 n. The same loci were selected to test CRISPR-mediated HR by co-transfecting HEK293FT cells with chimeric RNAs targeting EMX1, hspsca 9 or hspsca 9n and an HR template for introducing a pair of restriction sites (HindIII and NheI) near the protospacer. FIG. 4C provides a schematic representation of the HR strategy, including the relative positions of the recombination sites and primer annealing sequences (arrows). SpCas9 and SpCas9n did catalyze the integration of the HR template into the EMX1 locus. PCR amplification of the target region followed by restriction digestion with HindIII revealed cleavage products corresponding to the desired fragment size (shown as arrows in the restriction fragment length polymorphism assay in fig. 4D), with SpCas9 and SpCas9n mediating similar levels of HR efficiency. Applicants further confirmed HR using sanger sequencing of genomic amplicons (fig. 4E). These results demonstrate the utility of CRISPR to facilitate targeted gene insertion in the genome of a mammal. Given that 14-bp (12-bp from spacer and 2-bp from PAM) specifically targets the wild-type SpCas9, the availability of nickases can significantly reduce the likelihood of off-target modification, since single-strand breaks are not substrates for the error-prone NHEJ pathway.
Expression constructs mimicking the natural configuration of CRISPR loci with arrayed spacers were constructed (fig. 2A) to test the potential for multiple sequence targeting. Using a single CRISPR array encoding a pair of EMX 1-and PVALB-targeting spacers, efficient cleavage was detected at both loci (fig. 4F, showing both the schematic design of the crRNA array and the Surveyor blot showing efficient modification of cleavage). Targeted deletion of a larger genomic region was also detected by co-existing DSBs using spacers against two targets within EMX1 spaced by 119bp, and 1.6% deletion efficiency was detected (3 out of 182 amplicons; fig. 4G). This demonstrates that the CRISPR system can mediate multiplex editing in a single genome.
Example 2: CRISPR system modifications and alternatives
The ability to use RNA to program sequence-specific DNA cleavage defines a new class of genome engineering tools for a variety of research and industrial applications. Several aspects of the CRISPR system can be further improved to increase the efficiency and versatility of CRISPR targeting. Optimized Cas9 activity may be dependent on free Mg in the specific presence in mammalian cell nuclei2+High level of free Mg2+See, e.g., jinnek et al, 2012, "Science (Science), 337:816) and the preference for the NGG motif located just downstream of the protospacer limits the ability to target on average every 12-bp in the human genome (fig. 9, both plus and minus strands of the human chromosomal sequence are evaluated), some of these constraints can be overcome by exploring the diversity of the CRISPR locus across microbial metagenomes (see, e.g., Makarova et al, 2011, review in natural microbiology (Nat Rev Microbiol), 9:467), other CRISPR loci can be transplanted into the mammalian cell environment by methods similar to those described in example 1, fig. 10 shows the adaptation of the CRISPR1 from streptococcus thermophilus LMD-9 for heterologous expression in mammalian cells type II CRISPR system to achieve mediated genome editing, fig. 10A provides the CRISPR-9-derived CRISPR promoter expression schematic, fig. 10 shows that the CRISPR promoter expression using the CRISPR rna expression promoter expression schematic of cass et al, fig. 24, shows the use of the CRISPR rna expression promoter expression schematic of cass rna expression system for promoting constitutive expression of CRISPR rna expression of casse rna, fig. 10A mature version. Sequences from mature crRNA and tracrRNA are shown. A single base in the crRNA sequence, indicated by the lower case "a", is used to remove the polyU sequence, which is the RNA polIII transcription terminator. Figure 10C provides a schematic showing the guide sequence targeting the human EMX1 locus. Figure 10D shows the results of hStCas9 mediated cleavage in the target locus using the Surveyor assay. RNA guide spacers 1 and 2 induced 14% and 6.4%, respectively. A statistical analysis of cleavage activity across the biological replicates at these two prototypical spacer sites is also provided in figure 5. Figure 14 provides a schematic representation of additional proto-spacer of the streptococcus thermophilus CRISPR system and the corresponding PAM sequence target in the human EMX1 locus. The two prototype spacer sequences are highlighted and the corresponding PAM sequences that satisfy the NNAGAAW motif are indicated by underlining the 3' relative to the corresponding highlighted sequences. Both protospacer targets the antisense strand.
Example 3: sample target sequence selection algorithm
A software program was designed to identify candidate CRISPR target sequences on both strands of an input DNA sequence based on the desired guide sequence length and CRISPR motif sequence (PAM) for a given CRISPR enzyme. For example, 5' -N can be searched by searching on both the input sequence and the reverse complement of the input sequencexNGG-3' to identify target sites from Cas9 of streptococcus pyogenes with the PAM sequence NGG. Likewise, target sites for Cas9 of streptococcus pyogenes CRISPR1 having the PAM sequence NNAGAAW can be identified by searching for 5 '-Nx-NNAGAAW-3' on both the input sequence and the reverse complement of the input sequence. Likewise, 5' -N can be searched by searching on both the input sequence and the reverse complement of the input sequencex-NGGNG-3' to identify target sites for Cas9 of streptococcus pyogenes CRISPR3 with the PAM sequence NGGNG. N can be fixed by a program or specified by a userxA value of "x", such as 20.
Since multiple occurrences in the genome of a DNA target site can lead to non-specific genome editing, after all potential sites are identified, the procedure filters out the sequences based on the number of occurrences in the relevant reference genome. For those CRISPR enzymes whose sequence specificity is determined by a ' seed ' sequence (e.g. 11-12bp 5 ' from a PAM sequence, including the PAM sequence itself), the filtration step may be based on the seed sequence. Thus, to avoid editing at additional genomic loci, seed-based: the number of times the PAM sequence appeared in the relevant genome filtered the results. The user may be allowed to select the length of the seed sequence. The user may also be allowed to specify the seed for the purpose of passing through the filter: the number of times the PAM sequence appears in the genome. Unique sequences were screened by default. The filtration level was varied by varying both the length of the seed sequence and the number of times the sequence appeared in the genome. The program may additionally or alternatively provide a sequence of guide sequences complementary to the reported one or more target sequences by providing the reverse complement of the identified one or more target sequences. An exemplary visualization of some target sites in the human genome is provided in fig. 18.
Additional details of methods and algorithms for optimizing sequence selection may be found in U.S. application Ser. No. 61/064,798 (attorney docket No. 44790.11.2022; Border reference BI-2012/084), which is incorporated herein by reference.
Example 4: evaluation of various chimeric crRNA-tracrRNA hybrids
This example describes the results obtained for chimeric RNAs (chiRNAs; including guide sequences, tracr mate sequences and tracr sequences in a single transcript) with tracr sequences incorporating wild-type tracr RNA sequences of different lengths. Fig. 16a shows a schematic of a bicistronic expression vector for chimeric RNA and Cas 9. Cas9 is driven by the CBh promoter and the chimeric RNA is driven by the U6 promoter. The chimeric guide RNA consists of a20 bp guide sequence (N) joined to a tracr sequence (from the first "U" of the lower strand to the end of the transcript), which is truncated at each point as indicated. The guide and tracr sequences are separated by the tracr-mate sequence GUUUUAGAGCUA (SEQ ID NO:13), followed by the loop sequence GAAA. The results of the SURVEYOR assay for Cas9 mediated indels at human EMX1 and PVALB loci are shown in figures 16b and 16c, respectively. The arrow indicates the expected SURVEYOR fragment. ChiRNA is indicated by its "+ n" designation, and crRNA refers to hybrid RNA that directs and tracr sequences to be expressed as separate transcripts. Quantification of these results, performed in triplicate, is shown in the histograms of fig. 17a and 17b, corresponding to fig. 16b and 16c, respectively ("n.d." indicates no indels detected). Prototype spacer IDs and their corresponding genomic targets, prototype spacers, PAM sequences, and strand positions are provided in table D. The guide sequence is designed to be complementary to the entire protospacer sequence (in the case of separate transcripts in a hybrid system), or to be only partially underlined (in the case of chimeric RNA).
Table D:
Figure BDA0002377677250000971
additional details for optimizing guide sequences may be found in U.S. application Ser. No. 61/836,127 (attorney docket No. 44790.08.2022; Border reference No. BI-2013/004G), which is incorporated herein by reference.
Initially, three sites within the EMX1 locus were targeted in human HEK293FT cells. The genome modification efficiency of each chiRNA was evaluated using the SURVEYOR nuclease assay that detects mutations caused by DNA Double Strand Breaks (DSBs) and their subsequent repair via non-homologous end joining (NHEJ) DNA damage repair pathway. Constructs designated as chiRNA (+ n) indicate that the up to + nth nucleotide of the wild type tracrRNA is included in the chimeric RNA construct, with values of 48, 54, 67 and 85 for n. The chimeric RNAs contained long fragments of wild-type tracrRNA (chiRNA (+67) and chiRNA (+85)) mediated DNA cleavage at all three EMX1 target sites, with the chiRNA (+85) exhibiting, inter alia, significantly higher levels of DNA cleavage than the corresponding crRNA/tracrRNA hybrids expressing the guide sequence and tracr sequence as separate transcripts (fig. 16b and 17 a). chiRNA was also used to target two sites in the PVALB locus, which did not produce detectable cleavage using the hybrid system (guide sequence and tracr sequence expressed as separate transcripts). chiRNA (+67) and chiRNA (+85) were able to mediate significant cleavage at two PVALB proto-spacers (fig. 16c and 17 b).
For all five targets in EMX1 and PVALB loci, a consistently increased efficiency of genome modification was observed with increased tracr sequence length. Without wishing to be bound by any theory, the secondary structure formed by the 3' end of the tracrRNA may play a role in enhancing the CRISPR complex formation rate.
Example 5: cas9 diversity
The CRISPR-Cas system is an acquired immune mechanism against invasive foreign DNA utilized by distinct species across bacteria and archaea. The type II CRISPR-Cas9 system consists of a set of genes encoding proteins responsible for "trapping" (acquisition) of foreign DNA into the CRISPR locus and a set of genes encoding proteins responsible for the "execution" of the DNA cleavage mechanism; these include DNA nucleases (Cas9), non-coding transactivating cr-rna (tracrrna), and exogenous DNA-derived spacer arrays (crRNA) flanked by direct repeats. Upon maturation by Cas9, the tracrrna and crRNA duplexes direct Cas9 nuclease to a target DNA sequence specified by the spacer guide sequence and mediate a double strand break in the DNA near a short sequence motif that is required for cleavage and specific for each CRISPR-Cas system. The type II CRISPR-Cas system is found to be highly diverse throughout the bacterial kingdom and in terms of Cas9 protein sequence and size for target cleavage, tracrRNA and crRNA direct repeats, genomic organization of these elements, and motif requirements. One species can have multiple distinct CRISPR-Cas systems.
Applicants evaluated 207 putative Cas9 from bacterial species identified based on sequence homology to known Cas9 and structures orthologous to known subdomains including HNH endonuclease domain and RuvC endonuclease domain [ information from eugenine Koonin and kraakura (KiraMakarova) ]. Phylogenetic analysis based on this set of protein sequence conservation revealed five Cas9 families, including three large groups of Cas9 (-1400 amino acids) and two small groups of Cas9 (-1100 amino acids) (see fig. 19 and 20A-F).
Additional details of the mutation of Cas9 and Cas9 enzymes to convert to nickases or DNA binding proteins and their use with altered functionality can be found in U.S. application serial nos. 61/836,101 and 61/835,936 (attorney docket nos. 44790.09.2022 and 4790.07.2022 and bode reference nos. BI-2013/004E and BI-2013/004F, respectively), which are incorporated herein by reference.
Example 6: cas9 ortholog
Applicants analyzed Cas9 orthologs to identify related PAM sequences and corresponding chimeric guide RNAs. PAM with a set of expansions provides broader targeting across the genome and also significantly increases the number of unique target sites and provides the potential to identify novel Cas9 with increased levels of specificity in the genome.
The specificity of Cas9 orthologs can be assessed by testing the ability of each Cas9 to tolerate mismatches between the guide RNA and its DNA target. For example, the specificity of SpCas9 has been characterized by testing the effect of mutations in the guide RNA on cleavage efficiency. A library of guide RNAs is created with single or multiple mismatches between the guide sequence and the target DNA. Based on these findings, the target site for SpCas9 can be selected based on the following criteria:
to maximize the specificity of SpCas9 to edit a particular gene, a target site should be selected within the locus of interest such that the potential 'off-target' genomic sequence obeys the following four constraints: first, they should not be followed by PAM with 5' -NGG or NAG sequences. Second, their overall sequence similarity to the target sequence should be minimized. Third, the maximum number of mismatches should be located within the PAM-proximal region of the off-target site. Finally, the maximum number of mismatches should be consecutive or separated by less than four bases.
Similar methods can be used to assess the specificity of other Cas9 orthologs and establish criteria for selecting specific target sites within the genome of the target species. As previously described, phylogenetic analysis based on this set of protein sequence conservation revealed five Cas9 families, including three large sets of Cas9 (-1400 amino acids) and two small sets of Cas9 (-1100 amino acids) (see fig. 19 and 20A-F). Additional details of Cas orthologs may be found in U.S. application serial nos. 61/836,101 and 61/835,936 (attorney docket nos. 44790.09.2022 and 4790.07.2022, respectively, and bode reference nos. BI-2013/004E and BI-2013/004F, respectively), which are incorporated herein by reference.
Example 7: engineering plants (microalgae) using Cas9 to target and manipulate plant genes
Methods of delivering Cas9
Method 1 applicants delivered Cas9 and guide RNA using a vector expressing Cas9 under the control of a constitutive promoter (such as Hsp70A-Rbc S2 or β 2-tubulin).
Method 2 applicants delivered Cas9 and T7 polymerase using vectors that express Cas9 and T7 polymerase under the control of constitutive promoters (such as Hsp70A-Rbc S2 or β 2-tubulin.) this guide RNA will be delivered using a vector that contains the T7 promoter that drives the guide RNA.
The method 3 comprises the following steps: applicants delivered Cas9 mRNA and in vitro transcribed guide RNA into algal cells. RNA may be transcribed in vitro. Cas9 mRNA will consist of the coding region of Cas9 and the 3' UTR from Cop1 to ensure stability of Cas9 mRNA.
For homologous recombination, applicants provide an additional template for homology-directed repair.
The sequence of the cassette driving expression of Cas9 under the control of the β -2 tubulin promoter located after the 3' UTR of Cop 1.
TCTTTCTTGCGCTATGACACTTCCAGCAAAAGGTAGGGCGGGCTGCGAGACGGCTTCCCGGCGCTGCATGCAACACCGATGATGCTTCGACCCCCCGAAGCTCCTTCGGGGCTGCATGGGCGCTCCGATGCCGCTCCAGGGCGAGCGCTGTTTAAATAGCCAGGCCCCCGATTGCAAAGACATTATAGCGAGCTACCAAAGCCATATTCAAACACCTAGATCACTACCACTTCTACACAGGCCACTCGAGCTTGTGATCGCACTCCGCTAAGGGGGCGCCTCTTCCTCTTCGTTTCAGTCACAACCCGCAAACATGTACCCATACGATGTTCCAGATTACGCTTCGCCGAAGAAAAAGCGCAAGGTCGAAGCGTCCGACAAGAAGTACAGCATCGGCCTGGACATCGGCACCAACTCTGTGGGCTGGGCCGTGATCACCGACGAGTACAAGGTGCCCAGCAAGAAATTCAAGGTGCTGGGCAACACCGACCGGCACAGCATCAAGAAGAACCTGATCGGAGCCCTGCTGTTCGACAGCGGCGAAACAGCCGAGGCCACCCGGCTGAAGAGAACCGCCAGAAGAAGATACACCAGACGGAAGAACCGGATCTGCTATCTGCAAGAGATCTTCAGCAACGAGATGGCCAAGGTGGACGACAGCTTCTTCCACAGACTGGAAGAGTCCTTCCTGGTGGAAGAGGATAAGAAGCACGAGCGGCACCCCATCTTCGGCAACATCGTGGACGAGGTGGCCTACCACGAGAAGTACCCCACCATCTACCACCTGAGAAAGAAACTGGTGGACAGCACCGACAAGGCCGACCTGCGGCTGATCTATCTGGCCCTGGCCCACATGATCAAGTTCCGGGGCCACTTCCTGATCGAGGGCGACCTGAACCCCGACAACAGCGACGTGGACAAGCTGTTCATCCAGCTGGTGCAGACCTACAACCAGCTGTTCGAGGAAAACCCCATCAACGCCAGCGGCGTGGACGCCAAGGCCATCCTGTCTGCCAGACTGAGCAAGAGCAGACGGCTGGAAAATCTGATCGCCCAGCTGCCCGGCGAGAAGAAGAATGGCCTGTTCGGCAACCTGATTGCCCTGAGCCTGGGCCTGACCCCCAACTTCAAGAGCAACTTCGACCTGGCCGAGGATGCCAAACTGCAGCTGAGCAAGGACACCTACGACGACGACCTGGACAACCTGCTGGCCCAGATCGGCGACCAGTACGCCGACCTGTTTCTGGCCGCCAAGAACCTGTCCGACGCCATCCTGCTGAGCGACATCCTGAGAGTGAACACCGAGATCACCAAGGCCCCCCTGAGCGCCTCTATGATCAAGAGATACGACGAGCACCACCAGGACCTGACCCTGCTGAAAGCTCTCGTGCGGCAGCAGCTGCCTGAGAAGTACAAAGAGATTTTCTTCGACCAGAGCAAGAACGGCTACGCCGGCTACATTGACGGCGGAGCCAGCCAGGAAGAGTTCTACAAGTTCATCAAGCCCATCCTGGAAAAGATGGACGGCACCGAGGAACTGCTCGTGAAGCTGAACAGAGAGGACCTGCTGCGGAAGCAGCGGACCTTCGACAACGGCAGCATCCCCCACCAGATCCACCTGGGAGAGCTGCACGCCATTCTGCGGCGGCAGGAAGATTTTTACCCATTCCTGAAGGACAACCGGGAAAAGATCGAGAAGATCCTGACCTTCCGCATCCCCTACTACGTGGGCCCTCTGGCCAGGGGAAACAGCAGATTCGCCTGGATGACCAGAAAGAGCGAGGAAACCATCACCCCCTGGAACTTCGAGGAAGTGGTGGACAAGGGCGCTTCCGCCCAGAGCTTCATCGAGCGGATGACCAACTTCGATAAGAACCTGCCCAACGAGAAGGTGCTGCCCAAGCACAGCCTGCTGTACGAGTACTTCACCGTGTATAACGAGCTGACCAAAGTGAAATACGTGACCGAGGGAATGAGAAAGCCCGCCTTCCTGAGCGGCGAGCAGAAAAAGGCCATCGTGGACCTGCTGTTCAAGACCAACCGGAAAGTGACCGTGAAGCAGCTGAAAGAGGACTACTTCAAGAAAATCGAGTGCTTCGACTCCGTGGAAATCTCCGGCGTGGAAGATCGGTTCAACGCCTCCCTGGGCACATACCACGATCTGCTGAAAATTATCAAGGACAAGGACTTCCTGGACAATGAGGAAAACGAGGACATTCTGGAAGATATCGTGCTGACCCTGACACTGTTTGAGGACAGAGAGATGATCGAGGAACGGCTGAAAACCTATGCCCACCTGTTCGACGACAAAGTGATGAAGCAGCTGAAGCGGCGGAGATACACCGGCTGGGGCAGGCTGAGCCGGAAGCTGATCAACGGCATCCGGGACAAGCAGTCCGGCAAGACAATCCTGGATTTCCTGAAGTCCGACGGCTTCGCCAACAGAAACTTCATGCAGCTGATCCACGACGACAGCCTGACCTTTAAAGAGGACATCCAGAAAGCCCAGGTGTCCGGCCAGGGCGATAGCCTGCACGAGCACATTGCCAATCTGGCCGGCAGCCCCGCCATTAAGAAGGGCATCCTGCAGACAGTGAAGGTGGTGGACGAGCTCGTGAAAGTGATGGGCCGGCACAAGCCCGAGAACATCGTGATCGAAATGGCCAGAGAGAACCAGACCACCCAGAAGGGACAGAAGAACAGCCGCGAGAGAATGAAGCGGATCGAAGAGGGCATCAAAGAGCTGGGCAGCCAGATCCTGAAAGAACACCCCGTGGAAAACACCCAGCTGCAGAACGAGAAGCTGTACCTGTACTACCTGCAGAATGGGCGGGATATGTACGTGGACCAGGAACTGGACATCAACCGGCTGTCCGACTACGATGTGGACCATATCGTGCCTCAGAGCTTTCTGAAGGACGACTCCATCGACAACAAGGTGCTGACCAGAAGCGACAAGAACCGGGGCAAGAGCGACAACGTGCCCTCCGAAGAGGTCGTGAAGAAGATGAAGAACTACTGGCGGCAGCTGCTGAACGCCAAGCTGATTACCCAGAGAAAGTTCGACAATCTGACCAAGGCCGAGAGAGGCGGCCTGAGCGAACTGGATAAGGCCGGCTTCATCAAGAGACAGCTGGTGGAAACCCGGCAGATCACAAAGCACGTGGCACAGATCCTGGACTCCCGGATGAACACTAAGTACGACGAGAATGACAAGCTGATCCGGGAAGTGAAAGTGATCACCCTGAAGTCCAAGCTGGTGTCCGATTTCCGGAAGGATTTCCAGTTTTACAAAGTGCGCGAGATCAACAACTACCACCACGCCCACGACGCCTACCTGAACGCCGTCGTGGGAACCGCCCTGATCAAAAAGTACCCTAAGCTGGAAAGCGAGTTCGTGTACGGCGACTACAAGGTGTACGACGTGCGGAAGATGATCGCCAAGAGCGAGCAGGAAATCGGCAAGGCTACCGCCAAGTACTTCTTCTACAGCAACATCATGAACTTTTTCAAGACCGAGATTACCCTGGCCAACGGCGAGATCCGGAAGCGGCCTCTGATCGAGACAAACGGCGAAACCGGGGAGATCGTGTGGGATAAGGGCCGGGATTTTGCCACCGTGCGGAAAGTGCTGAGCATGCCCCAAGTGAATATCGTGAAAAAGACCGAGGTGCAGACAGGCGGCTTCAGCAAAGAGTCTATCCTGCCCAAGAGGAACAGCGATAAGCTGATCGCCAGAAAGAAGGACTGGGACCCTAAGAAGTACGGCGGCTTCGACAGCCCCACCGTGGCCTATTCTGTGCTGGTGGTGGCCAAAGTGGAAAAGGGCAAGTCCAAGAAACTGAAGAGTGTGAAAGAGCTGCTGGGGATCACCATCATGGAAAGAAGCAGCTTCGAGAAGAATCCCATCGACTTTCTGGAAGCCAAGGGCTACAAAGAAGTGAAAAAGGACCTGATCATCAAGCTGCCTAAGTACTCCCTGTTCGAGCTGGAAAACGGCCGGAAGAGAATGCTGGCCTCTGCCGGCGAACTGCAGAAGGGAAACGAACTGGCCCTGCCCTCCAAATATGTGAACTTCCTGTACCTGGCCAGCCACTATGAGAAGCTGAAGGGCTCCCCCGAGGATAATGAGCAGAAACAGCTGTTTGTGGAACAGCACAAGCACTACCTGGACGAGATCATCGAGCAGATCAGCGAGTTCTCCAAGAGAGTGATCCTGGCCGACGCTAATCTGGACAAAGTGCTGTCCGCCTACAACAAGCACCGGGATAAGCCCATCAGAGAGCAGGCCGAGAATATCATCCACCTGTTTACCCTGACCAATCTGGGAGCCCCTGCCGCCTTCAAGTACTTTGACACCACCATCGACCGGAAGAGGTACACCAGCACCAAAGAGGTGCTGGACGCCACCCTGATCCACCAGAGCATCACCGGCCTGTACGAGACACGGATCGACCTGTCTCAGCTGGGAGGCGACAGCCCCAAGAAGAAGAGAAAGGTGGAGGCCAGCTAAGGATCCGGCAAGACTGGCCCCGCTTGGCAACGCAACAGTGAGCCCCTCCCTAGTGTGTTTGGGGATGTGACTATGTATTCGTGTGTTGGCCAACGGGTCAACCCGAACAGATTGATACCCGCCTTGGCATTTCCTGTCAGAATGTAACGTCAGTTGATGGTACT(SEQ ID NO:19)
The sequence of the cassette driving expression of T7 polymerase under the control of the β -2 tubulin promoter located after the 3' UTR of Cop 1:
TCTTTCTTGCGCTATGACACTTCCAGCAAAAGGTAGGGCGGGCTGCGAGACGGCTTCCCGGCGCTGCATGCAACACCGATGATGCTTCGACCCCCCGAAGCTCCTTCGGGGCTGCATGGGCGCTCCGATGCCGCTCCAGGGCGAGCGCTGTTTAAATAGCCAGGCCCCCGATTGCAAAGACATTATAGCGAGCTACCAAAGCCATATTCAAACACCTAGATCACTACCACTTCTACACAGGCCACTCGAGCTTGTGATCGCACTCCGCTAAGGGGGCGCCTCTTCCTCTTCGTTTCAGTCACAACCCGCAAACatgcctaagaagaagaggaaggttaacacgattaacatcgctaagaacgacttctctgacatcgaactggctgctatcccgttcaacactctggctgaccattacggtgagcgtttagctcgcgaacagttggcccttgagcatgagtcttacgagatgggtgaagcacgcttccgcaagatgtttgagcgtcaacttaaagctggtgaggttgcggataacgctgccgccaagcctctcatcactaccctactccctaagatgattgcacgcatcaacgactggtttgaggaagtgaaagctaagcgcggcaagcgcccgacagccttccagttcctgcaagaaatcaagccggaagccgtagcgtacatcaccattaagaccactctggcttgcctaaccagtgctgacaatacaaccgttcaggctgtagcaagcgcaatcggtcgggccattgaggacgaggctcgcttcggtcgtatccgtgaccttgaagctaagcacttcaagaaaaacgttgaggaacaactcaacaagcgcgtagggcacgtctacaagaaagcatttatgcaagttgtcgaggctgacatgctctctaagggtctactcggtggcgaggcgtggtcttcgtggcataaggaagactctattcatgtaggagtacgctgcatcgagatgctcattgagtcaaccggaatggttagcttacaccgccaaaatgctggcgtagtaggtcaagactctgagactatcgaactcgcacctgaatacgctgaggctatcgcaacccgtgcaggtgcgctggctggcatctctccgatgttccaaccttgcgtagttcctcctaagccgtggactggcattactggtggtggctattgggctaacggtcgtcgtcctctggcgctggtgcgtactcacagtaagaaagcactgatgcgctacgaagacgtttacatgcctgaggtgtacaaagcgattaacattgcgcaaaacaccgcatggaaaatcaacaagaaagtcctagcggtcgccaacgtaatcaccaagtggaagcattgtccggtcgaggacatccctgcgattgagcgtgaagaactcccgatgaaaccggaagacatcgacatgaatcctgaggctctcaccgcgtggaaacgtgctgccgctgctgtgtaccgcaaggacaaggctcgcaagtctcgccgtatcagccttgagttcatgcttgagcaagccaataagtttgctaaccataaggccatctggttcccttacaacatggactggcgcggtcgtgtttacgctgtgtcaatgttcaacccgcaaggtaacgatatgaccaaaggactgcttacgctggcgaaaggtaaaccaatcggtaaggaaggttactactggctgaaaatccacggtgcaaactgtgcgggtgtcgacaaggttccgttccctgagcgcatcaagttcattgaggaaaaccacgagaacatcatggcttgcgctaagtctccactggagaacacttggtgggctgagcaagattctccgttctgcttccttgcgttctgctttgagtacgctggggtacagcaccacggcctgagctataactgctcccttccgctggcgtttgacgggtcttgctctggcatccagcacttctccgcgatgctccgagatgaggtaggtggtcgcgcggttaacttgcttcctagtgaaaccgttcaggacatctacgggattgttgctaagaaagtcaacgagattctacaagcagacgcaatcaatgggaccgataacgaagtagttaccgtgaccgatgagaacactggtgaaatctctgagaaagtcaagctgggcactaaggcactggctggtcaatggctggcttacggtgttactcgcagtgtgactaagcgttcagtcatgacgctggcttacgggtccaaagagttcggcttccgtcaacaagtgctggaagataccattcagccagctattgattccggcaagggtctgatgttcactcagccgaatcaggctgctggatacatggctaagctgatttgggaatctgtgagcgtgacggtggtagctgcggttgaagcaatgaactggcttaagtctgctgctaagctgctggctgctgaggtcaaagataagaagactggagagattcttcgcaagcgttgcgctgtgcattgggtaactcctgatggtttccctgtgtggcaggaatacaagaagcctattcagacgcgcttgaacctgatgttcctcggtcagttccgcttacagcctaccattaacaccaacaaagatagcgagattgatgcacacaaacaggagtctggtatcgctcctaactttgtacacagccaagacggtagccaccttcgtaagactgtagtgtgggcacacgagaagtacggaatcgaatcttttgcactgattcacgactccttcggtacgattccggctgacgctgcgaacctgttcaaagcagtgcgcgaaactatggttgacacatatgagtcttgtgatgtactggctgatttctacgaccagttcgctgaccagttgcacgagtctcaattggacaaaatgccagcacttccggctaaaggtaacttgaacctccgtgacatcttagagtcggacttcgcgttcgcgtaaGGATCCGGCAAGACTGGCCCCGCTTGGCAACGCAACAGTGAGCCCCTCCCTAGTGTGTTTGGGGATGTGACTATGTATTCGTGTGTTGGCCAACGGGTCAACCCGAACAGATTGATACCCGCCTTGGCATTTCCTGTCAGAATGTAACGTCAGTTGATGGTACT(SEQ ID NO:20)
sequence of the guide RNA driven by the T7 promoter (T7 promoter, N denotes targeting sequence):
gaaatTAATACGACTCACTATANNNNNNNNNNNNNNNNNNNNgttttagagctaGAAAtagcaagttaaaataaggctagtccgttatcaacttgaaaaagtggcaccgagtcggtgcttttttt(SEQ ID NO:21)
gene delivery:
chlamydomonas reinhardtii strains CC-124 and CC-125 from the Chlamydomonas Resource Center (Chlamydomonas Resource Center) will be used for electroporation. The electroporation protocol followed the standard recommended protocol from the GeneArt Chlamydomonas Engineering kit.
Moreover, applicants generated chlamydomonas reinhardtii lines constitutively expressing Cas 9. This can be done by using pChlamy1 (linearized using PvuI) and selecting hygromycin resistant colonies. The following is the sequence of pChlamy1 containing Cas 9. Achieving gene knock-out in this way simply requires the delivery of RNA that directs RNA. For homologous recombination, applicants delivered a guide RNA and linearized homologous recombination templates.
pChlamy1-Cas9：
TGCGGTATTTCACACCGCATCAGGTGGCACTTTTCGGGGAAATGTGCGCGGAACCCCTATTTGTTTATTTTTCTAAATACATTCAAATATGTATCCGCTCATGAGATTATCAAAAAGGATCTTCACCTAGATCCTTTTAAATTAAAAATGAAGTTTTAAATCAATCTAAAGTATATATGAGTAAACTTGGTCTGACAGTTACCAATGCTTAATCAGTGAGGCACCTATCTCAGCGATCTGTCTATTTCGTTCATCCATAGTTGCCTGACTCCCCGTCGTGTAGATAACTACGATACGGGAGGGCTTACCATCTGGCCCCAGTGCTGCAATGATACCGCGAGACCCACGCTCACCGGCTCCAGATTTATCAGCAATAAACCAGCCAGCCGGAAGGGCCGAGCGCAGAAGTGGTCCTGCAACTTTATCCGCCTCCATCCAGTCTATTAATTGTTGCCGGGAAGCTAGAGTAAGTAGTTCGCCAGTTAATAGTTTGCGCAACGTTGTTGCCATTGCTACAGGCATCGTGGTGTCACGCTCGTCGTTTGGTATGGCTTCATTCAGCTCCGGTTCCCAACGATCAAGGCGAGTTACATGATCCCCCATGTTGTGCAAAAAAGCGGTTAGCTCCTTCGGTCCTCCGATCGTTGTCAGAAGTAAGTTGGCCGCAGTGTTATCACTCATGGTTATGGCAGCACTGCATAATTCTCTTACTGTCATGCCATCCGTAAGATGCTTTTCTGTGACTGGTGAGTACTCAACCAAGTCATTCTGAGAATAGTGTATGCGGCGACCGAGTTGCTCTTGCCCGGCGTCAATACGGGATAATACCGCGCCACATAGCAGAACTTTAAAAGTGCTCATCATTGGAAAACGTTCTTCGGGGCGAAAACTCTCAAGGATCTTACCGCTGTTGAGATCCAGTTCGATGTAACCCACTCGTGCACCCAACTGATCTTCAGCATCTTTTACTTTCACCAGCGTTTCTGGGTGAGCAAAAACAGGAAGGCAAAATGCCGCAAAAAAGGGAATAAGGGCGACACGGAAATGTTGAATACTCATACTCTTCCTTTTTCAATATTATTGAAGCATTTATCAGGGTTATTGTCTCATGACCAAAATCCCTTAACGTGAGTTTTCGTTCCACTGAGCGTCAGACCCCGTAGAAAAGATCAAAGGATCTTCTTGAGATCCTTTTTTTCTGCGCGTAATCTGCTGCTTGCAAACAAAAAAACCACCGCTACCAGCGGTGGTTTGTTTGCCGGATCAAGAGCTACCAACTCTTTTTCCGAAGGTAACTGGCTTCAGCAGAGCGCAGATACCAAATACTGTTCTTCTAGTGTAGCCGTAGTTAGGCCACCACTTCAAGAACTCTGTAGCACCGCCTACATACCTCGCTCTGCTAATCCTGTTACCAGTGGCTGTTGCCAGTGGCGATAAGTCGTGTCTTACCGGGTTGGACTCAAGACGATAGTTACCGGATAAGGCGCAGCGGTCGGGCTGAACGGGGGGTTCGTGCACACAGCCCAGCTTGGAGCGAACGACCTACACCGAACTGAGATACCTACAGCGTGAGCTATGAGAAAGCGCCACGCTTCCCGAAGGGAGAAAGGCGGACAGGTATCCGGTAAGCGGCAGGGTCGGAACAGGAGAGCGCACGAGGGAGCTTCCAGGGGGAAACGCCTGGTATCTTTATAGTCCTGTCGGGTTTCGCCACCTCTGACTTGAGCGTCGATTTTTGTGATGCTCGTCAGGGGGGCGGAGCCTATGGAAAAACGCCAGCAACGCGGCCTTTTTACGGTTCCTGGCCTTTTGCTGGCCTTTTGCTCACATGTTCTTTCCTGCGTTATCCCCTGATTCTGTGGATAACCGTATTACCGCCTTTGAGTGAGCTGATACCGCTCGCCGCAGCCGAACGACCGAGCGCAGCGAGTCAGTGAGCGAGGAAGCGGTCGCTGAGGCTTGACATGATTGGTGCGTATGTTTGTATGAAGCTACAGGACTGATTTGGCGGGCTATGAGGGCGGGGGAAGCTCTGGAAGGGCCGCGATGGGGCGCGCGGCGTCCAGAAGGCGCCATACGGCCCGCTGGCGGCACCCATCCGGTATAAAAGCCCGCGACCCCGAACGGTGACCTCCACTTTCAGCGACAAACGAGCACTTATACATACGCGACTATTCTGCCGCTATACATAACCACTCAGCTAGCTTAAGATCCCATCAAGCTTGCATGCCGGGCGCGCCAGAAGGAGCGCAGCCAAACCAGGATGATGTTTGATGGGGTATTTGAGCACTTGCAACCCTTATCCGGAAGCCCCCTGGCCCACAAAGGCTAGGCGCCAATGCAAGCAGTTCGCATGCAGCCCCTGGAGCGGTGCCCTCCTGATAAACCGGCCAGGGGGCCTATGTTCTTTACTTTTTTACAAGAGAAGTCACTCAACATCTTAAAATGGCCAGGTGAGTCGACGAGCAAGCCCGGCGGATCAGGCAGCGTGCTTGCAGATTTGACTTGCAACGCCCGCATTGTGTCGACGAAGGCTTTTGGCTCCTCTGTCGCTGTCTCAAGCAGCATCTAACCCTGCGTCGCCGTTTCCATTTGCAGGAGATTCGAGGTACCATGTACCCATACGATGTTCCAGATTACGCTTCGCCGAAGAAAAAGCGCAAGGTCGAAGCGTCCGACAAGAAGTACAGCATCGGCCTGGACATCGGCACCAACTCTGTGGGCTGGGCCGTGATCACCGACGAGTACAAGGTGCCCAGCAAGAAATTCAAGGTGCTGGGCAACACCGACCGGCACAGCATCAAGAAGAACCTGATCGGAGCCCTGCTGTTCGACAGCGGCGAAACAGCCGAGGCCACCCGGCTGAAGAGAACCGCCAGAAGAAGATACACCAGACGGAAGAACCGGATCTGCTATCTGCAAGAGATCTTCAGCAACGAGATGGCCAAGGTGGACGACAGCTTCTTCCACAGACTGGAAGAGTCCTTCCTGGTGGAAGAGGATAAGAAGCACGAGCGGCACCCCATCTTCGGCAACATCGTGGACGAGGTGGCCTACCACGAGAAGTACCCCACCATCTACCACCTGAGAAAGAAACTGGTGGACAGCACCGACAAGGCCGACCTGCGGCTGATCTATCTGGCCCTGGCCCACATGATCAAGTTCCGGGGCCACTTCCTGATCGAGGGCGACCTGAACCCCGACAACAGCGACGTGGACAAGCTGTTCATCCAGCTGGTGCAGACCTACAACCAGCTGTTCGAGGAAAACCCCATCAACGCCAGCGGCGTGGACGCCAAGGCCATCCTGTCTGCCAGACTGAGCAAGAGCAGACGGCTGGAAAATCTGATCGCCCAGCTGCCCGGCGAGAAGAAGAATGGCCTGTTCGGCAACCTGATTGCCCTGAGCCTGGGCCTGACCCCCAACTTCAAGAGCAACTTCGACCTGGCCGAGGATGCCAAACTGCAGCTGAGCAAGGACACCTACGACGACGACCTGGACAACCTGCTGGCCCAGATCGGCGACCAGTACGCCGACCTGTTTCTGGCCGCCAAGAACCTGTCCGACGCCATCCTGCTGAGCGACATCCTGAGAGTGAACACCGAGATCACCAAGGCCCCCCTGAGCGCCTCTATGATCAAGAGATACGACGAGCACCACCAGGACCTGACCCTGCTGAAAGCTCTCGTGCGGCAGCAGCTGCCTGAGAAGTACAAAGAGATTTTCTTCGACCAGAGCAAGAACGGCTACGCCGGCTACATTGACGGCGGAGCCAGCCAGGAAGAGTTCTACAAGTTCATCAAGCCCATCCTGGAAAAGATGGACGGCACCGAGGAACTGCTCGTGAAGCTGAACAGAGAGGACCTGCTGCGGAAGCAGCGGACCTTCGACAACGGCAGCATCCCCCACCAGATCCACCTGGGAGAGCTGCACGCCATTCTGCGGCGGCAGGAAGATTTTTACCCATTCCTGAAGGACAACCGGGAAAAGATCGAGAAGATCCTGACCTTCCGCATCCCCTACTACGTGGGCCCTCTGGCCAGGGGAAACAGCAGATTCGCCTGGATGACCAGAAAGAGCGAGGAAACCATCACCCCCTGGAACTTCGAGGAAGTGGTGGACAAGGGCGCTTCCGCCCAGAGCTTCATCGAGCGGATGACCAACTTCGATAAGAACCTGCCCAACGAGAAGGTGCTGCCCAAGCACAGCCTGCTGTACGAGTACTTCACCGTGTATAACGAGCTGACCAAAGTGAAATACGTGACCGAGGGAATGAGAAAGCCCGCCTTCCTGAGCGGCGAGCAGAAAAAGGCCATCGTGGACCTGCTGTTCAAGACCAACCGGAAAGTGACCGTGAAGCAGCTGAAAGAGGACTACTTCAAGAAAATCGAGTGCTTCGACTCCGTGGAAATCTCCGGCGTGGAAGATCGGTTCAACGCCTCCCTGGGCACATACCACGATCTGCTGAAAATTATCAAGGACAAGGACTTCCTGGACAATGAGGAAAACGAGGACATTCTGGAAGATATCGTGCTGACCCTGACACTGTTTGAGGACAGAGAGATGATCGAGGAACGGCTGAAAACCTATGCCCACCTGTTCGACGACAAAGTGATGAAGCAGCTGAAGCGGCGGAGATACACCGGCTGGGGCAGGCTGAGCCGGAAGCTGATCAACGGCATCCGGGACAAGCAGTCCGGCAAGACAATCCTGGATTTCCTGAAGTCCGACGGCTTCGCCAACAGAAACTTCATGCAGCTGATCCACGACGACAGCCTGACCTTTAAAGAGGACATCCAGAAAGCCCAGGTGTCCGGCCAGGGCGATAGCCTGCACGAGCACATTGCCAATCTGGCCGGCAGCCCCGCCATTAAGAAGGGCATCCTGCAGACAGTGAAGGTGGTGGACGAGCTCGTGAAAGTGATGGGCCGGCACAAGCCCGAGAACATCGTGATCGAAATGGCCAGAGAGAACCAGACCACCCAGAAGGGACAGAAGAACAGCCGCGAGAGAATGAAGCGGATCGAAGAGGGCATCAAAGAGCTGGGCAGCCAGATCCTGAAAGAACACCCCGTGGAAAACACCCAGCTGCAGAACGAGAAGCTGTACCTGTACTACCTGCAGAATGGGCGGGATATGTACGTGGACCAGGAACTGGACATCAACCGGCTGTCCGACTACGATGTGGACCATATCGTGCCTCAGAGCTTTCTGAAGGACGACTCCATCGACAACAAGGTGCTGACCAGAAGCGACAAGAACCGGGGCAAGAGCGACAACGTGCCCTCCGAAGAGGTCGTGAAGAAGATGAAGAACTACTGGCGGCAGCTGCTGAACGCCAAGCTGATTACCCAGAGAAAGTTCGACAATCTGACCAAGGCCGAGAGAGGCGGCCTGAGCGAACTGGATAAGGCCGGCTTCATCAAGAGACAGCTGGTGGAAACCCGGCAGATCACAAAGCACGTGGCACAGATCCTGGACTCCCGGATGAACACTAAGTACGACGAGAATGACAAGCTGATCCGGGAAGTGAAAGTGATCACCCTGAAGTCCAAGCTGGTGTCCGATTTCCGGAAGGATTTCCAGTTTTACAAAGTGCGCGAGATCAACAACTACCACCACGCCCACGACGCCTACCTGAACGCCGTCGTGGGAACCGCCCTGATCAAAAAGTACCCTAAGCTGGAAAGCGAGTTCGTGTACGGCGACTACAAGGTGTACGACGTGCGGAAGATGATCGCCAAGAGCGAGCAGGAAATCGGCAAGGCTACCGCCAAGTACTTCTTCTACAGCAACATCATGAACTTTTTCAAGACCGAGATTACCCTGGCCAACGGCGAGATCCGGAAGCGGCCTCTGATCGAGACAAACGGCGAAACCGGGGAGATCGTGTGGGATAAGGGCCGGGATTTTGCCACCGTGCGGAAAGTGCTGAGCATGCCCCAAGTGAATATCGTGAAAAAGACCGAGGTGCAGACAGGCGGCTTCAGCAAAGAGTCTATCCTGCCCAAGAGGAACAGCGATAAGCTGATCGCCAGAAAGAAGGACTGGGACCCTAAGAAGTACGGCGGCTTCGACAGCCCCACCGTGGCCTATTCTGTGCTGGTGGTGGCCAAAGTGGAAAAGGGCAAGTCCAAGAAACTGAAGAGTGTGAAAGAGCTGCTGGGGATCACCATCATGGAAAGAAGCAGCTTCGAGAAGAATCCCATCGACTTTCTGGAAGCCAAGGGCTACAAAGAAGTGAAAAAGGACCTGATCATCAAGCTGCCTAAGTACTCCCTGTTCGAGCTGGAAAACGGCCGGAAGAGAATGCTGGCCTCTGCCGGCGAACTGCAGAAGGGAAACGAACTGGCCCTGCCCTCCAAATATGTGAACTTCCTGTACCTGGCCAGCCACTATGAGAAGCTGAAGGGCTCCCCCGAGGATAATGAGCAGAAACAGCTGTTTGTGGAACAGCACAAGCACTACCTGGACGAGATCATCGAGCAGATCAGCGAGTTCTCCAAGAGAGTGATCCTGGCCGACGCTAATCTGGACAAAGTGCTGTCCGCCTACAACAAGCACCGGGATAAGCCCATCAGAGAGCAGGCCGAGAATATCATCCACCTGTTTACCCTGACCAATCTGGGAGCCCCTGCCGCCTTCAAGTACTTTGACACCACCATCGACCGGAAGAGGTACACCAGCACCAAAGAGGTGCTGGACGCCACCCTGATCCACCAGAGCATCACCGGCCTGTACGAGACACGGATCGACCTGTCTCAGCTGGGAGGCGACAGCCCCAAGAAGAAGAGAAAGGTGGAGGCCAGCTAACATATGATTCGAATGTCTTTCTTGCGCTATGACACTTCCAGCAAAAGGTAGGGCGGGCTGCGAGACGGCTTCCCGGCGCTGCATGCAACACCGATGATGCTTCGACCCCCCGAAGCTCCTTCGGGGCTGCATGGGCGCTCCGATGCCGCTCCAGGGCGAGCGCTGTTTAAATAGCCAGGCCCCCGATTGCAAAGACATTATAGCGAGCTACCAAAGCCATATTCAAACACCTAGATCACTACCACTTCTACACAGGCCACTCGAGCTTGTGATCGCACTCCGCTAAGGGGGCGCCTCTTCCTCTTCGTTTCAGTCACAACCCGCAAACATGACACAAGAATCCCTGTTACTTCTCGACCGTATTGATTCGGATGATTCCTACGCGAGCCTGCGGAACGACCAGGAATTCTGGGAGGTGAGTCGACGAGCAAGCCCGGCGGATCAGGCAGCGTGCTTGCAGATTTGACTTGCAACGCCCGCATTGTGTCGACGAAGGCTTTTGGCTCCTCTGTCGCTGTCTCAAGCAGCATCTAACCCTGCGTCGCCGTTTCCATTTGCAGCCGCTGGCCCGCCGAGCCCTGGAGGAGCTCGGGCTGCCGGTGCCGCCGGTGCTGCGGGTGCCCGGCGAGAGCACCAACCCCGTACTGGTCGGCGAGCCCGGCCCGGTGATCAAGCTGTTCGGCGAGCACTGGTGCGGTCCGGAGAGCCTCGCGTCGGAGTCGGAGGCGTACGCGGTCCTGGCGGACGCCCCGGTGCCGGTGCCCCGCCTCCTCGGCCGCGGCGAGCTGCGGCCCGGCACCGGAGCCTGGCCGTGGCCCTACCTGGTGATGAGCCGGATGACCGGCACCACCTGGCGGTCCGCGATGGACGGCACGACCGACCGGAACGCGCTGCTCGCCCTGGCCCGCGAACTCGGCCGGGTGCTCGGCCGGCTGCACAGGGTGCCGCTGACCGGGAACACCGTGCTCACCCCCCATTCCGAGGTCTTCCCGGAACTGCTGCGGGAACGCCGCGCGGCGACCGTCGAGGACCACCGCGGGTGGGGCTACCTCTCGCCCCGGCTGCTGGACCGCCTGGAGGACTGGCTGCCGGACGTGGACACGCTGCTGGCCGGCCGCGAACCCCGGTTCGTCCACGGCGACCTGCACGGGACCAACATCTTCGTGGACCTGGCCGCGACCGAGGTCACCGGGATCGTCGACTTCACCGACGTCTATGCGGGAGACTCCCGCTACAGCCTGGTGCAACTGCATCTCAACGCCTTCCGGGGCGACCGCGAGATCCTGGCCGCGCTGCTCGACGGGGCGCAGTGGAAGCGGACCGAGGACTTCGCCCGCGAACTGCTCGCCTTCACCTTCCTGCACGACTTCGAGGTGTTCGAGGAGACCCCGCTGGATCTCTCCGGCTTCACCGATCCGGAGGAACTGGCGCAGTTCCTCTGGGGGCCGCCGGACACCGCCCCCGGCGCCTGATAAGGATCCGGCAAGACTGGCCCCGCTTGGCAACGCAACAGTGAGCCCCTCCCTAGTGTGTTTGGGGATGTGACTATGTATTCGTGTGTTGGCCAACGGGTCAACCCGAACAGATTGATACCCGCCTTGGCATTTCCTGTCAGAATGTAACGTCAGTTGATGGTACT(SEQ ID NO:22)。
For all modified Chlamydomonas reinhardtii cells, the applicants used PCR, SURVEYOR nuclease assay and DNA sequencing to verify successful modification.
While preferred embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous variations, changes, and substitutions will now occur to those skilled in the art without departing from the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. It is intended that the following claims define the scope of the invention and that methods and structures within the scope of these claims and their equivalents be covered thereby.
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Claims (1)

1. A method of altering the expression of one or more gene products, the method comprising introducing into a cell comprising and expressing DNA molecules encoding the one or more gene products an engineered non-naturally occurring CRISPR-Cas system comprising a Cas protein and one or more guide RNAs, the one or more guide RNAs targeting the DNA molecules, whereby the one or more guide RNAs target the genomic loci of the DNA molecules encoding the one or more gene products and the Cas protein cleaves the genomic loci of the DNA molecules encoding the one or more gene products, whereby the expression of the one or more gene products is altered; and, wherein the Cas protein and the guide RNA do not naturally occur together.
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